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:
Jul. 21, 2009
Filed:
Apr. 05, 2005
Masaki Matsudo, Koka, JP;
Masaki Matsudo, Koka, JP;
Sekisui Chemical Co., Ltd., Osaka, JP;
Abstract
A thermoplastic resin sheet is provided which has good penetration resistance over a range from low to high temperature region and can be used as an intermediate film of a laminated glass. The thermoplastic resin sheet has such a layered structure that a first polyvinyl acetal resin layer (A) is provided on each side of a second polyvinyl acetal resin layer (B). The first polyvinyl acetal resin layer (A) is comprised mainly of an acetalized product of polyvinyl alcohol with aldehyde (a) having 4-6 carbon atoms. The second polyvinyl acetal resin layer (B) is comprised mainly of a coacetalized product of polyvinyl alcohol with aldehyde (a) having 4-6 carbon atoms and aldehyde (b) having 1-3 carbon atoms. A polymer unit (X) derived from the aldehyde (a) and a polymer unit (Y) derived from the aldehyde (b), in total, account for at least 55% by mole while the first polymer unit (X) alone accounts for 0.5-80% by mole of the total of the coacetalized product.