| Patent Number |
Title Of Patent |
Date Issued |
| T994004 |
Process for the preparation of diphenylmethane dicarbamates and polymethylene polyphenyl carbama |
May 6, 1980 |
| Diphenylmethane dicarbamates and polymethylene polyphenyl carbamate homologs and derivatives of these compounds are produced by the condensation of N-aryl carbamic acid esters, such as ethylphenylcarbamate, with formaldehyde, para-formaldehyde or trioxane in the presence of strongly |
| 7563740 |
Direct epoxidation process |
July 21, 2009 |
| A catalyst comprising a transition metal zeolite and a noble metal is disclosed. The catalyst is prepared by an extrusion method using a comb-branched polymer as an extrusion aid. The catalyst is used in a reaction to produce epoxide from an olefin, hydrogen, and oxygen. The comb-bra |
| 7232875 |
Preparation of comb-branched polymers |
June 19, 2007 |
| A comb-branched polymer is disclosed. The polymer comprises recurring units of an unsaturated carboxylic monomer, an oxypropylene-rich poly(oxyethylene-oxypropylene) macromonomer and an oxyethylene-rich poly(oxyethylene-oxypropylene) macromonomer. The comb-branched polymer can be use |
| 7175918 |
Polyolefin compositions |
February 13, 2007 |
| The present invention relates to polyolefin compositions that incorporate an acrylic/polyether comb-branched copolymer, articles made from the compositions, such as polyolefin films and polyolefin fibers, and methods for making the compositions and the articles. |
| 6815513 |
Process for preparing comb-branched polymers |
November 9, 2004 |
| A continuous process for making a comb-branched copolymer of an acrylic monomer and a polyether macromonomer is disclosed. The process is performed by continuously feeding a reaction zone with a monomer stream that contains an acrylic acid and a polyether macromonomer, and an initiat |
| 6214958 |
Process for preparing comb-branched polymers |
April 10, 2001 |
| A continuous process for making a comb-branched copolymer of an acrylic monomer and a polyether macromonomer is disclosed. The process is performed by continuously feeding a reaction zone with a monomer stream that contains an acrylic acid and a polyether macromonomer, and an initiat |
| 6034208 |
Copolymers useful as cement additives and a process for their preparation |
March 7, 2000 |
| Unique, well defined macromonomers containing hydroxyl-functionality, unsaturation-functionality, and polyoxyalkylene segments are prepared by oxyalkylating an unsaturated initiator molecule having at least one oxyalkylatable hydrogen in the presence of an effective amount of a double |
| 5985989 |
Method of making a water reducing additive for cement |
November 16, 1999 |
| Substances useful as water reducing and superplasticizer additives for cement compositions are formed by in situ polymerization of one or more ethylenically unsaturated acid monomers such as acrylic acid or maleic anhydride in a reaction medium comprising a polyether such as polyprop |
| 5938835 |
Cement composition |
August 17, 1999 |
| A cement admixture comprised of a mixture of certain alkyl ether oxyalkylene adducts with certain oxyalkylene glycols to provide cement compositions of mortar and concrete which inhibit drying shrinkage while permitting substantial air entrainment and enhanced compressive strength. |
| 5731476 |
Poly ether preparation |
March 24, 1998 |
| Polyethers of polyhydric compounds are prepared by the liquid phase reaction of polyhydric compound and the reaction being carried out with separate liquid phases comprised of a polar polyhydric compound phase and an organic polyether containing phase. |
| 5725654 |
Cement composition |
March 10, 1998 |
| There is provided a cement composition having improved fluidity comprising cement and an addition copolymer of (a) an adduct of a polyether polyol and an ethylenically unsaturated isocyanate with (b) an ethylenically unsaturated carboxylic acid. |
| 5723683 |
Separation of monoethers from diethers |
March 3, 1998 |
| Monoalkyl glycol ether is separated from dialkyl glycol ether by phase separation using a hydrocarbon solvent, preferably with the addition also of water. |
| 5670578 |
Cement additives |
September 23, 1997 |
| Substances useful as water reducing and superplasticizer additives for cement compositions are formed by reaction of carboxylic acid polymers with a mixture of monofunctional and difunctional polyethers derived from C.sub.2 -C.sub.4 epoxides wherein partial cleavage of the polyethers and |
| 5614017 |
Cement additives |
March 25, 1997 |
| Substances useful as water reducing and superplasticizer additives for cement compositions are formed by reaction of carboxylic acid polymers with polyethers of C.sub.2 -C.sub.4 epoxides wherein partial cleavage of the polyether and esterification of the polyether and the cleavage pr |
| 5565027 |
Cement composition |
October 15, 1996 |
| The invention relates to a cement composition containing a water reducing amount of the product formed by reaction of polyvinyl alcohol and an hydroxyaldehyde such as 4-hydroxybutanal. |
| 5413634 |
Cement composition |
May 9, 1995 |
| The invention relates to a cement composition containing a shrinkage reducing amount of an alkyl ether derivative of an aliphatic polyhydroxy compound of the formula:wherein Q is a C.sub.3 -C.sub.12 aliphatic hydrocarbon group, R is hydrogen or C.sub.1 -C.sub.10 alkyl, at least one R bei |
| 5241118 |
Process for the preparation of trisubstituted ureas by reductive carbonylation |
August 31, 1993 |
| A process for preparing trisubstituted ureas is disclosed. A nitroarene is reacted with carbon monoxide and a secondary amine in the presence of a Group VIII transition metal catalyst and optionally one or more promoters selected from primary amines, halide ion-containing compounds, and |
| 5227483 |
Process for recovery of amines and volatile acids from amine salts |
July 13, 1993 |
| A process for recovering both an amine and a volatile acid from an amine salt is disclosed. In the process, the amine salt is reacted with a non-volatile acid to liberate the volatile acid. Thermal decomposition of the resulting amine/non-volatile acid salt liberates the amine. |
| 5220061 |
Selective process for the preparation of diphenylmethane bis-(dialkyl ureas |
June 15, 1993 |
| A selective process for the preparation of diphenylmethane bis(dialkylureas) is disclosed. An alkyl phenylcarbamate or an N,N-dialkyl-N'-phenylurea is reacted with a methylene bis(alkyl carbamate) in the presence of an acid catalyst. The use of a staged addition of phenylcarbamate or |
| 5206412 |
Selective process for the preparation of diphenylmethane diisocyanate precursors |
April 27, 1993 |
| A selective process for the preparation of diphenylmethane diisocyanate precursors is disclosed. An alkyl phenylcarbamate or an N,N-dialkyl-N'-phenylurea is reacted with a methylene bis(alkyl carbamate) in the presence of an acid catalyst. The use of a staged addition of phenylcarbam |
| 4996359 |
Process for the preparation of aromatic bis dialkyl ureas |
February 26, 1991 |
| Aromatic bis (dialkyl) ureas such as the bis (dimethyl) urea of 2,4-toluenediamine are prepared by reacting an aromatic diamine with isocyanic acid (HNCO) to convert the amino groups of the diamine to urea groups (--NHCONH.sub.2) to give an aromatic bis urea which is then reacted wit |
| 4978779 |
Preparation of methylene diphenylene diisocyanates and polymethylene polyphenylene poly (isocyan |
December 18, 1990 |
| An improved process is provided for the preparation of methylene diphenylene diisocyanates (MDI) and polymethylene polyphenylene poly (isocyanates) (PMDI) by the thermal decomposition of a methylene diphenylene bis (dialkylurea) or a polymethylene polyphenylene poly (alkylurea) in a |
| 4883908 |
Process for the preparation of aromatic isocyanates from dialkyl ureas using an organic sulfonic |
November 28, 1989 |
| An improved process is provided for the preparation of aromatic mono- and poly-isocyanates by the thermal decomposition of an aromatic bis dialkyl urea in solvent in the presence of an organic sulfonic acid or sulfonated aromatic ion exchange resin as a promoter for conversion of the ure |
| 4873364 |
Process for the preparation of methylene diphenylene diisocyanates and polymethylene polyphenyle |
October 10, 1989 |
| An improved process is provided for the preparation of methylene diphenylene diisocyanates (MDI) and polymethylene polyphenylene poly (diisocyanates) by the thermal decomposition of a methylene diphenylene bis (dialkylurea) or a polymethylene polyphenylene poly (dialkylurea) in a sol |
| 4871871 |
Process for the preparation of aromatic mono- and polyisocyanates |
October 3, 1989 |
| An improved process is provided for the preparation of aromatic mono- and poly- isocyanates by the thermal decomposition of an aromatic bis dialkyl urea in solvent in the presence of a tertiary amine hydrohalide, such as pyridine hydrochloride, as a promoter for conversion of the urea gr |
| 4543419 |
Process for the preparation of diphenylmethane dicarbamates and polymethylene polyphenyl carbama |
September 24, 1985 |
| Diphenylmethane dicarbamates and polymethylene polyphenyl carbamate homologs and derivatives of these compounds are produced by the acid catalyzed condensation of an N-aryl carbamic acid ester, such as ethylphenylcarbamate, with a carbonyl compound, such as formaldehyde, at a reactio |
| 4230877 |
Method for increasing the 4,4'dicarbamate isomer of the diphenylmethane dicarbamates during prep |
October 28, 1980 |
| A method for increasing the 4,4' disubstituted isomer of the diphenylmethane dicarbamates produced by the acid catalyzed condensation of an N-aryl carbamic acid ester, such as ethylphenylcarbamate, with a carbonyl compound, such as formaldehyde, which comprises carrying out the conde |
| 4202986 |
Preparation of diphenylmethane dicarbamates and polymethylene polyphenyl carbamates with Lewis a |
May 13, 1980 |
| Diphenylmethane dicarbamates and polymethylene polyphenyl carbamate homologs and derivatives of these compounds are produced by the condensation of N-aryl carbamic acid esters, such as ethylphenylcarbamate, with a carbonyl compound selected from formaldehyde, para-formaldehyde or tri |
| 4172948 |
Preparation of diphenylmethane mono and dicarbamates and polymethylene polyphenyl carbamates |
October 30, 1979 |
| Diphenylmethane mono and dicarbamates and polymethylene polyphenyl carbamate homologs and derivatives of these compounds are prepared by employing a superatmospheric pressure of anhydrous hydrogen chloride to catalytically rearrange an (alkoxycarbonyl)phenylaminomethylphenyl compound |
| 4162362 |
Process for the preparation of diphenylmethane dicarbamates and polymethylene polyphenyl carbama |
July 24, 1979 |
| Diphenylmethane dicarbamates and polymethylene polyphenyl carbamate homologs and derivatives of these compounds are produced by the condensation of N-aryl carbamic acid esters, such as ethylphenylcarbamate, with formaldehyde, para-formaldehyde or trioxane in the presence of an organi |
| 4146727 |
Process for the preparation of diphenylmethane mono and dicarbamates and polymethylene polypheny |
March 27, 1979 |
| Diphenylmethane mono and dicarbamates and polymethylene polyphenyl carbamate homologs and derivatives of these compounds are produced by the protonic or Lewis acid catalyzed rearrangement of an (alkoxycarbonyl)phenylaminomethylphenyl compound having the general formula ##STR1## |
| 4130633 |
Removal of selenium from urethane solutions |
December 19, 1978 |
| A method for the removal and recovery of selenium from a urethane solution containing selenium compounds, which may be in the form of inorganic selenium and/or organoselenium compounds, which comprises contacting the selenium-containing urethane solution at a suitable temperature with an |
| 4055629 |
Process for the removal of selenium compounds from urethane solutions |
October 25, 1977 |
| A process for the recovery of selenium from a urethane solution containing selenium compounds which comprises contacting the selenium-containing urethane solution at a suitable temperature with copper (I) chloride, oxygen or an oxygen-containing gas such as air, and a complexing solvent |
