Hard organopolysiloxane release coating
First Claim
1. A composition of matter comprising(A) 100 parts by weight of a hydroxyfunctional polysiloxane resin copolymer containing CH3 SiO3/2 units, C6 H5 SiO3/2 units, (C6 H5)2 SiO units and C6 H5 (CH3)SiO units wherein there is present 0.5 to 5 weight percent hydroxy radicals attached to silicon atoms, the organic group to silicon ratio is from 0.8 to 1.4 and the C6 H5 -- to silicon ratio is from 0.35 to 0.85;
- (B) from 4 to 240 parts by weight, based on 100 parts of (A), of CH3 SiO3/2 ; and
(C) from 0.2 to 6 parts by weight, based on 100 parts of (A), of a fluid polysiloxane having the formula (RR'"'"'R"Si)2 O[(CH3)2 SiO]x, wherein x has a value of from 250 to 850, R is OH or CH3 -- and R'"'"' and R" are CH3 --, wherein there is present in component (C), less than fifteen percent by weight of (CH3)3 SiO units.
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Abstract
What is disclosed are organopolysiloxane release coatings which are curable on a substrate and which consist of a base siloxane copolymer containing CH3 SiO3/2 units; C6 H5 SiO3/2 units, C6 H5 (CH3)SiO units and (C6 H5)2 SiO units; CH3 SiO3/2 ; a fluid polysiloxane, and a curing agent. They are especially useful on commercial and household cookware and bakeware.
187 Citations
8 Claims
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1. A composition of matter comprising
(A) 100 parts by weight of a hydroxyfunctional polysiloxane resin copolymer containing CH3 SiO3/2 units, C6 H5 SiO3/2 units, (C6 H5)2 SiO units and C6 H5 (CH3)SiO units wherein there is present 0.5 to 5 weight percent hydroxy radicals attached to silicon atoms, the organic group to silicon ratio is from 0.8 to 1.4 and the C6 H5 -- to silicon ratio is from 0.35 to 0.85; -
(B) from 4 to 240 parts by weight, based on 100 parts of (A), of CH3 SiO3/2 ; and (C) from 0.2 to 6 parts by weight, based on 100 parts of (A), of a fluid polysiloxane having the formula (RR'"'"'R"Si)2 O[(CH3)2 SiO]x, wherein x has a value of from 250 to 850, R is OH or CH3 -- and R'"'"' and R" are CH3 --, wherein there is present in component (C), less than fifteen percent by weight of (CH3)3 SiO units. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification
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- Resources
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Current AssigneeDow, Inc.
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Original AssigneeDow, Inc.
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InventorsVincent, Harold L., Broderick, Dennis W.
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Primary Examiner(s)Schofer, Joseph L.
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Assistant Examiner(s)Teskin, F. M.
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Application NumberUS06/793,411Time in Patent Office628 DaysField of Search528/17, 528/33, 525/477, 524/860, 524/268, 524/773, 524/267US Class Current524/268CPC Class CodesC08L 83/00 Compositions of macromolecu...C09D 183/04 Polysiloxanes
