Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From silicon reactant having at least one...
Patent
1993-08-04
1994-09-06
Marquis, Melvyn I.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From silicon reactant having at least one...
528 27, 528 31, 528 32, 528 39, C08G 7708
Patent
active
053449053
ABSTRACT:
A diorganosiloxane polymer suitable for modifying thermosetting resins and its preparation are disclosed, said polymer being terminated at each molecular end with an epoxy group-containing organopolysiloxane residue of the following general formula ##STR1## wherein R.sup.1 is a monovalent hydrocarbon group free of alkenyl groups, R.sup.2 is selected from the group consisting of hydrogen and a monovalent hydrocarbon group free of alkenyl groups, R.sup.3 is a monovalent group selected from the group consisting of an epoxy group-containing organic group and an alkoxysilylalkyl group, with the proviso that at least one R.sup.3 group is an epoxy group-containing organic group, R.sup.4 is a divalent hydrocarbon group, a is zero or a positive number, b is a positive number, c is a positive number, a/c is a positive number in the range of zero to 4, b/c is a positive number in the range of 0.05 to 4, and (a+b)/c is a positive number in the range of 0.2 to 4.
REFERENCES:
patent: 4666745 (1987-05-01), Huhn et al.
patent: 5283309 (1994-02-01), Morita
Dow Corning Toray Silicone Co. Ltd.
Glass Margaret W.
Marquis Melvyn I.
Weitz Alexander
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