Liquid silicone rubber with improved compression set
First Claim
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1. A two component, addition-crosslinkable organopolysiloxane composition which crosslinks to give an elastomer, comprising;
- (A) a first component comprising a polyorganosiloxane (I) with at least two alkenyl groups per molecule and a metallic catalyst (IV) which promotes addition crosslinking, and(B) a second component comprising a polyorganosiloxane (II) with at least two silicon-bonded hydrogen atoms, and an organic sulfur compound (III).
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Abstract
The present invention relates to compositions which crosslink to give elastomers, comprising;
(A) a polyorganosiloxane (I) with at least two alkenyl groups per molecule and a metallic catalyst (IV) and
(B) a polyorganosiloxane (II) with at least two silicon-bonded hydrogen atoms and an organic sulfur compound (III).
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Citations
19 Claims
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1. A two component, addition-crosslinkable organopolysiloxane composition which crosslinks to give an elastomer, comprising;
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(A) a first component comprising a polyorganosiloxane (I) with at least two alkenyl groups per molecule and a metallic catalyst (IV) which promotes addition crosslinking, and (B) a second component comprising a polyorganosiloxane (II) with at least two silicon-bonded hydrogen atoms, and an organic sulfur compound (III). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 17)
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9. A two component, addition-crosslinkable organopolysiloxane composition, comprising:
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(A) a first component comprising a polyorganosiloxane (I) with at least two alkenyl groups per molecule, and a metallic catalyst which promotes addition-crosslinking; and (B) a second component comprising a polyorganosiloxane (II) with at least two silicon-bonded hydrogen atoms per molecule, and an effective, compression set-reducing amount of a silane bearing at least one sulfur-containing group, a thio-functional siloxane, or a mixture thereof. - View Dependent Claims (10, 11, 12, 18)
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13. A two component, addition-crosslinkable organopolysiloxane composition which crosslinks to give an elastomer, comprising;
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(A) a first component comprising a polyorganosiloxane (I) with at least two alkenyl groups per molecule and a metallic catalyst (IV) which promotes addition crosslinking, and (B) a second component comprising a polyorganosiloxane (II) with at least two silicon-bonded hydrogen atoms, and an organic sulfur compound (III); wherein said organic sulfur compound (III) is selected from a group consisting of thiols;
mercaptoimidazoles;
mercaptobenzimidazoles;
ketene X,S-acetals;
where X is N or S;
thioacetals;
sulfanes;
disulfanes;
polysulfanes;
thioamides;
thioureas;
thiuram;
bisthiocarbamoyl di- or polysulfanes;
thiuronium salts;
thiocarbamates;
dithiocarbamates; and
their Zn, Fe, Ni, Co, and Cu salts;
thiocyanates;
isothiocyanates;
thioaldehydes;
thioketones;
thiolactones;
thiocarboxylic acids;
thiophene;
1,2- and 1,3-dithiols;
1,2- and 1,3-dithiolehtiones;
mercaptothiazoles;
mercaptodithiazoles;
benzodithioles;
benzodithiolethiones;
benzthiazole;
phenothiazines;
thianthrenes; and
mixtures thereof. - View Dependent Claims (14, 15, 19)
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16. A method of decreasing the variation of compression set in two component addition-crosslinked organopolysiloxane elastomers which are stored prior to use, said method comprising adding to at least one component of said two component elastomer, from about 0.0001 weight percent to about 2 weight percent of an organic sulfur compound.
Specification