Terminal cluster vinyl silicones and acrylate cluster silicones therefrom
First Claim
1. A polyorganosiloxane polymer having terminal vinyl clusters represented by the formula
where the R groups are the same or different organic groups other than acrylic groups or groups co-curable therewith;
B is a polyorganosiloxane segment represented by the formula ##STR12## where x is an integer of at least 100;
C1 is D or a triorganosilyl group;
m is an integer of 1 or more;
n is 3 or 4; and
D is a linear polyorganosiloxane segment containing between 3 and about 50 siloxane repeat units at least 3 of which contain pendant alkenyl or alkynyl groups.
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Abstract
A polyorganosiloxane polymer having a structure represented by one of the formulas
(AB).sub.m C or [(AB).sub.m ].sub.n SiR.sub.(4-n)
where the R groups are the same or different organic groups other than acrylic groups or groups co-curable therewith; A is a linear polyorganosiloxane segment containing between 3 and about 50 siloxane repeat units at least 3 of which are acrylic group containing repeat units represented by the formula ##STR1## where R1 is lower alkyl, the R2 groups are the same or different alkylene, alkyleneoxy or alkenylene groups, and y is 0-4; B is a polyorganosiloxane segment represented by the formula ##STR2## where x is an integer of at least 100; C is A or a triorganosilyl group; m is an integer of 1 or more; and n is 3 or 4.
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Citations
5 Claims
- 1. A polyorganosiloxane polymer having terminal vinyl clusters represented by the formula
- space="preserve" listing-type="equation">(DB).sub.m C.sup.1 or [(DB).sub.m ].sub.n SiR.sub.(4-n)/2
where the R groups are the same or different organic groups other than acrylic groups or groups co-curable therewith;
B is a polyorganosiloxane segment represented by the formula ##STR12## where x is an integer of at least 100;
C1 is D or a triorganosilyl group;
m is an integer of 1 or more;
n is 3 or 4; and
D is a linear polyorganosiloxane segment containing between 3 and about 50 siloxane repeat units at least 3 of which contain pendant alkenyl or alkynyl groups.
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2. An organosiloxane block copolymer comprising:
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(a) at least one siloxane block having at least 100 siloxane units, said units having the formula R2 SiO, (b) at least one siloxane block consisting of between 3 and 50 siloxane units of the formula;
space="preserve" listing-type="equation">R.sup.1.sub.2 SiOand, optionally, (c) a siloxane block comprising a siloxane unit of the formula
space="preserve" listing-type="equation">RSiO.sub.1.5 or SiO.sub.2where R is alkyl, substituted alkyl or aryl; and
the R1 groups are the same or different R, alkenyl groups or alkynyl groups, provided that at least 3 units R12 SiO include an alkenyl or alkynyl group. - View Dependent Claims (3, 4, 5)
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Specification