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:
Mar. 02, 1993
Filed:
Jul. 10, 1991
Norsolor, , FR;
Abstract
Polymers of melt index between 1 and 20 dg/min, which comprise units (A) derived from ethylene, units (B) derived from an ethylenically unsaturated .alpha.,.beta.-dicarboxylic acid anhydride and, where appropriate, units (C) derived from an alkyl acrylate or methacrylate in which the alkyl group contains from 1 to 12 carbon atoms, characterized in that, per 100 moles, they comprise: from 83 to 99.7 moles of units (A), from 0.29 to 3 moles of units (B), from 0 to 13.6 moles of units (C) and, furthermore, from 0.01 to 0.4 moles of units (D) derived from at least one polyol polyacrylate or polymethacrylate. Their process of preparation consists of copolymerizing a mixture of ethylene, an anhydride of an ethylenically unsaturated .alpha.,.beta.-dicarboxylic acid, at least one polyol polyacrylate or polymethacrylate and, where appropriate, at least one alkyl acrylate or methacrylate, at a temperature of between 140.degree. and 280.degree. C., under a pressure of between 1,000 and 2,500 bars, in the pressure of at least one free radical initiator, and is characterized in that the polyol polyacrylate or polymethacrylate is dissolved in a solvent prior to the copolymerization.