Siloxane co-polymers,申请号GB19620025847-传众专利搜索

Siloxane co-polymers

申请公布号：GB960142(A)

申请号：GB19620025847

申请日期：1962.07.05

申请公布日期：1964.06.10

申请人：

DOW CORNING CORPORATION

分类号：C08G77/00;C08G77/38;C08G77/48;C08G77/52;C09D5/25

主分类号：C08G77/00

摘要：<p>The invention comprises co-polymers essentially of (1) units of the general formula <FORM:0960142/C3/1> and/or of the general formula <FORM:0960142/C3/2> and (2) units of the general formula (Si(R2) (OSiR2)mOSi(R2)- and/or of the general formula HSi(R2)(OsiR2)mOSi(R2)- in which co-polyme the mol ratio of total units (1) to total units (2) is from 1:2 to 2:1, wherein X is H, -CH3, or halogen, Y is -CH2-, -C(CH3) (C6H5)-, -CH(CH3)-, -C(CH3)2- or oxygen, a is 0 or 1, R is methyl or phenyl, there being at least one phenyl radical per two methyl radicals and m is zero or an integer from 1 to 50. The co-polymers are best prepared by reacting allyl ethers of the formula <FORM:0960142/C3/3> with <FORM:0960142/C3/4> in the presence of a Pt catalyst. The copolymers can b cured by cross-linking them with siloxanes containing Si-bonded vinyl radicals or H atoms or both, in the presence of a Pt catalyst. In a typical example (1) a mixture of sym-diphenyl-dimethyldisiloxane, 4,-41-bis-allyloxy-diphenyl toluene and a butanol solution of H2PtCl6 was warmed t yield a liquid polymer of the average formula <FORM:0960142/C3/5> The polymer was cured, by heating with C6H5Si[OSi(CH3)2CH=CH2]3, to a tough, thermoset, flexible resin, which showed good adhesion to Al and Cu Uses: for the preparation of thermosetting adhesives. U.S.A. Specification 2,227,805 is referred to.</p>