Basit H. Shah Ph.D.
Engineering at Brandermill Ct, Evans, GA
License number
Louisiana PE.0021710
Issued Date
Mar 27, 1985
Expiration Date
Mar 31, 2011
Category
Civil Engineer
Type
Chemical Engineer
Address
Address
4571 Brandermill Ct, Evans, GA 30809
Professional information
Method For Making Thermoplastic Foam With Combined 1,1-Difluoroethane And Co.sub.2 Blowing Agent
US Patent:
5411683, May 2, 1995
Filed:
Aug 20, 1993
Appl. No.:
8/110276
Inventors:
Basit H. Shah - Evans GA
Assignee:
Sweetheart Cup Company Inc. - Chicago IL
International Classification:
B29C 4420
US Classification:
264 50
Abstract:
A method is disclosed for making thermoplastic foam wherein the blowing agent is a combination of 1,1-difluoroethane and CO. sub. 2 gas. Applicant has found that the combined blowing agents unexpectedly have significantly enhanced blowing agent efficiency, so that 1 lb of CO. sub. 2 gas per hour can replace as much as 2-3 lbs 1,1-difluoroethane per hour, while still providing satisfactory efficiency as a blowing agent. The foams so produced are capable of being manufactured into foam articles of acceptable quality. Preferred proportions of the blowing agents to produce foams of desired densities are disclosed.