The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 08, 1993
Filed:
May. 26, 1992
Applicant:
Inventors:
Brian R Maurer, Midland, MI (US);
Mitchell G Dibbs, Midland, MI (US);
Assignee:
The Dow Chemical Company, Midland, MI (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08F / ;
U.S. Cl.
CPC ...
526262 ; 5263077 ; 5253268 ; 5253276 ; 5253299 ; 5253305 ;
Abstract
Intrinsically low birefringent molding polymers having a molten stress optic coefficient that is greater than or equal to -1000 Brewsters and less than or equal to +1000 Brewsters, a glass transition temperature of at least 140.degree. C., and a water absorption (A.sub.H.sbsb.2.sub.O) according to ASTM D570-81 after 24 hours immersion in water at 23.degree. C. of less than 0.25 percent comprising in polymerized form at least one structural component providing a positive melt homopolymer stress optic coefficient and at least one other structural component providing a negative melt homopolymer stress optic coefficient.