| Patent Number |
Title Of Patent |
Date Issued |
| 5237048 |
Method for purifying polymer |
August 17, 1993 |
| There is disclosed a method for purifying a polymer by extracting volatile materials contained in the molten polymer. According to the disclosure, a polymer having a very high degree of extraction of volatile materials can be obtained. The polymer obtained by the method of disclosure can |
| 5133913 |
Method for producing a foamed resin using a blowing and extracting agent |
July 28, 1992 |
| There is disclosed a method for producing a foamed resin which incolves the steps of removing volatile substances from a polymer by contacting the polymer with an extractant and foaming the purified polymer by using the same extractant dissolved in the polymer as a foaming agent. Accordi |
| 4510988 |
Tube for thermal cracking or reforming hydrocarbon and manufacturing method thereof |
April 16, 1985 |
| A reactor tube for thermally cracking or reforming hydrocarbons comprising a tube member made of Fe-Cr-Ni heat resisting material and a covering layer of self-fluxing alloy fusing to the inner surface of the tube member, the covering layer made of heat resisting material free from Ni or |
| 4486472 |
Method of preventing a combustion furnace from corrosion |
December 4, 1984 |
| Corrosion of a combustion furnace is prevented by a coating of an alkali metal carbonate or an alkaline earth metal carbonate formed on metal surfaces of the furnace before it has started operation. |
| 4444732 |
Tube for thermal cracking or reforming of hydrocarbon |
April 24, 1984 |
| A reactor tube for thermally cracking or reforming of hydrocarbons wherein a reacting layer contacting hydrocarbons is made of heat resisting steel comprising, in terms of % by weight, 0.3 to 1.5% C, up to 3% Si, 6 to 15% Mn, 20 to 30% Cr, up to 3% Nb, up to 0.15% N, the balance being |
| 4444731 |
Tube for thermal cracking or reforming hydrocarbon |
April 24, 1984 |
| A reactor tube for thermally cracking or reforming hydrocarbons comprising an outer tube member made of Ni-containing heat resisting material and having enhanced mechanical strength with a large wall thickness, and an inner tube member of small wall thickness fitted in the outer tube mem |
