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Inventor:
Hoffmann; Kurt
Address:
Lautertal, DE
No. of patents:
15
Patents:












Patent Number Title Of Patent Date Issued
6525158 Process for the stabilization of a stabilizer mixtures for recycled plastic mixtures February 25, 2003
Recycled mixtures of plastics, predominantly thermoplastics, as predominantly produced in the household, in commerce and also in industry and useful material collections, can be stabilized against thermooxidative degradation by adding a combination of a sterically hindered phenol with
6251972 Process for the stabilization of and stabilizer mixtures for single-material recycled plastics June 26, 2001
Single-material recycled thermoplastics from commercial and industrial waste can be stabilized against thermal oxidative degradation by adding a combination of a sterically hindered phenol with an organic phosphite or phosphonite and an inorganic compound from the series consisting of me
6077891 Stabilization of damaged thermoplastics June 20, 2000
Damaged thermoplastics can be outstandingly stabilized by the use of a mixture comprising a) 0.05 to 20% by weight, based on the plastic to be stabilized, of at least one polyfunctional epoxide, b) 0.01 to 2% by weight, based on the plastic to be stabilized, of at least one sterically
5859073 Polyester/polycarbonate blends having enhanced properties January 12, 1999
A PES/PC blend having enhanced properties as virgin material and as recyclate comprises:A) at least one metal oxide or metal salt of a fatty acid; andB) at least one phosphite and at least one sterically hindered phenol orat least one difunctional epoxy resin ora combination of both.
5804623 Process for the stabilization of and stablizer mixtures for recycled plastics September 8, 1998
Recycled plastics, predominandy thermoplastics, from domestic, commercial and industrial waste can be stabilized against thermooxidative degradation by adding a combination of a sterically hindered phenol with an organic phosphite or phosphonite and a metal salt of a fatty acid.
5756596 Increasing the molecular weight of polyamides May 26, 1998
An increase in the molecular weight of a polyamide or recycled polyamide, essentially without crosslinking, can be achieved by blending said polyamide with a polyfunctional epoxy resin and a sterically hindered hydroxyphenylalkylphosphonic acid ester or half-ester and heating the ble
5747606 Increasing the molecular weight of polyesters and premix useful for this process May 5, 1998
An increase in the molecular weight of polyester and recycled polyester can be achieved by blending said polyester with a difunctional epoxy resin and a sterically hindered hydroxyphenylalkylphosphonic acid ester or half-ester and heating the blend to above the melting point (glass t
5744554 Polyester/polycarbonate blends having enhanced properties April 28, 1998
A polyester/polycarbonate (PES/PC) blend having enhanced properties as virgin material and as recyclate comprisesa) at least one phosphite,b) at least one sterically hindered phenol,c) at least one compound promoting the reaction of an epoxy resin with a PES/PC blend which is a Lewis base, a
5693681 Increasing the molecular weight of polyesters December 2, 1997
A process is disclosed for increasing the molecular weight of polyesters, polyester copolymers or polyester blends, which comprises heating a polyester blended with a tetracarboxylic acid dianhydride and a sterically hindered hydroxyphenylalkylphosphonic acid ester or half-ester to above
5643985 Process for the stabilization of and stabilizer mixtures for recycled plastics July 1, 1997
Recycled plastics, predominanty thermoplastics, from domestic, commercial and industrial waste can be stabilized against thermooxidative degradation by adding a combination of a sterically hindered phenol with an organic phosphite or phosphonite and a metal salt of a fatty acid.
5496920 Increasing the molecular weight of polyamides March 5, 1996
An increase in the molecular weight of newly produced polyamides and recycled polyamide materials can be achieved by heating to above the melting point or glass transition point and adding of a bismaleimide and a sterically hindered hydroxyphenyl-alkyl-phosphonic acid ester or half-e
5270435 Polyarylene ethers December 14, 1993
Polyarylene ethers which, based on the total amount of the structural units present in the polyether resin, contain 2-100 mol % of a recurring structural unit of formula I ##STR1## and 0-98 mol % of a recurring structural unit of formula II wherein each a is 1 or 2, 10 to 100% o
5212278 Polyarylene ethers May 18, 1993
The invention relates to polyarylene ethers which contain, based on the total amount of structural elements present in the polyether resin, 5-100 mol % of a recurring structural element of the formula I ##STR1## and 0-95 mol % of a recurring structural element of the formula II #
5212264 Modified polyarylene ether sulfones May 18, 1993
There are disclosed substantially linear polyarylene ether sulfones having a reduced viscosity of having a reduced viscosity of ca. 0.25 to ca. 1.5 dl/g (measured in a 1% solution in DMF at 25.degree. C.) and consisting essentially of 95-99.8% by weight of segments of formula I and of 5-
5126427 Soluble polyarylene ether sulfones June 30, 1992
Polyarylene ether sulfones which have a reduced viscosity of 0.1 to 2.0 dl/g, measured at 25.degree. C. in a 1% solution in N-methylpyrrolidone (NMP), and which contain, based on the total number of structural units present in the polyarylene ether sulfone resin, 99-1 mol % of a recurrin










 
 
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