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. 19, 1998
Filed:
Aug. 11, 1995
Susumu Kawase, Sayama, JP;
Tatsuhiro Imai, Sayama, JP;
Soken Chemical & Engineering Co., Ltd., Tokyo, JP;
Abstract
The acrylic sheet of the invention is an acrylic sheet containing particles homogeneously dispersed in a resin matrix which does not substantially contain air bubbles and has an air bubble content of not more than 10% by volume; in which the resin matrix for constituting the acrylic sheet is a crosslinked (meth)acrylic copolymer obtained by forming a crosslinked structure among the molecules of a (meth)acrylic copolymer, which is a copolymer of 0.1-15% by weight of a polymerizable monomer having a functional group, 60-99.9% by weight of a (meth)acrylic acid alkyl ester and 0-39.9% by weight of other monomer and has a weight-average molecular weight of 150,000 to 1,200,000, by means of a polyfunctional compound having reactivity to the functional group of the polymerizable monomer for preparing the (meth)acrylic copolymer; and the particles dispersed in the resin matrix formed from the crosslinked (meth)acrylic copolymer have a mean particle diameter of 1 to 100 .mu.m and a true specific gravity of 0.2 to 3.0. This acrylic sheet can be prepared by synthesizing a specific (meth)acrylic copolymer in an aqueous medium or an organic solvent, mixing a reaction solution of the copolymer with the polyfunctional compound and particles, casting the deformed mixture and drying it. The acrylic adhesive sheet of the invention is an adhesive sheet having an adhesive layer provided on at least one surface of the acrylic sheet, and can be prepared by forming the adhesive layer on the surface of the acrylic sheet.