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:
May. 09, 1978
Filed:
May. 19, 1976
Dale Skalla, Cicero, IL (US);
William C Meisenhelder, Downers Grove, IL (US);
Henry Alsberg, Northbrook, IL (US);
The Richardson Company, Des Plaines, IL (US);
Abstract
A phonograph record molding composition formed by copolymerizing a vinyl aromatic monomer with an acrylic ester monomer in the presence of one or more waxes which composition is especially suitable for injection and compression molding and which is characterized by substantially improved wear resistance, particularly when compared to conventional polystyrene record molding materials. The compositions of this invention comprise about 90 to 98, preferably 94 to 97, weight percent of vinyl aromatic/acrylic ester copolymer (with the weight ratio of vinyl aromatic to acrylic ester of from about 10:1 to 40:1), about 1 to 9, preferably 3 to 6, weight percent of the wax component and about 0.1 to 3, preferably 0.1 to 0.8, weight percent of a suitable lubricant. Preferred copolymers are styrene/2-ethylhexyl acrylate and styrene/stearyl methacrylate copolymers.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile