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:
Dec. 10, 1996
Filed:
May. 20, 1994
Tsutomu Nakamura, Annaka, JP;
Satao Hirabayashi, Annaka, JP;
Shin-Etsu Chemical Co., Ltd., Tokyo, JP;
Abstract
A silicone rubber roll is characteristically prepared on a metallic center by forming a layer of the cured product of a silicone rubber composition which comprises (A) organopolysiloxane, in which the total amount of low molecular weight siloxanes having a degree of polymerization ranging from 3 to 20 is controlled to be at most 10,000 ppm, (B) reinforcing silica powder with a specific surface area of at least 50 m.sup.2 /g, (C) silicone elastomer particles with an average particle size of 200 .mu.m, in which the total amount of low molecular weight siloxanes having a degree of polymerization ranging from 3 to 20 is 2,000 ppm or less, and (D) a curing agent. The total amount of low molecular weight siloxanes having a degree of polymerization ranging from 3 to 20 within the cured product layer is controlled to be 2,000 ppm or less, since the elimination of the low molecular weight siloxanes having a degree of polymerization ranging from 3 to 20 proceeds effectively during the processes of the silicone rubber composition preparation, forming, and curing. Therefore, the obtained roll is extremely useful for various types of rolls utilized in copying machines which particularly need to avoid the low molecular weight siloxanes.