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US 5,296,568 AGranted
Addition-cured silicone elastomers and coated fusing rolls using such elastomers
AssigneeEastman Kodak Company
InventorsTsang J. Chen, Paul L. Nielsen
Life of this patent
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Abstract
Toner fusing rolls with improved properties are formed with an outer layer comprising an addition-cured silicone elastomer. Such as elastomer is formed by crosslinking hydride substituted organopolysiloxanes and polyimides substituted with unsaturated hydrocarbon radicals.
Claims12
An addition-cured silicone elastomer comprising:
- about 10 to 30 weight percent of a hydride-substituted organopolysiloxane polymer containing at least three hydride groups;
- about 5 to 15 weight percent of a lower alkenyl-substituted organopolysiloxane polymer;
- about 1 to 5 weight percent of a polyimide substituted with terminal aliphatic unsaturated hydrocarbon radicals;
- and
- about 50 to 75 weight percent of a filler;
- wherein crosslinking is present between the hydride-bearing silicon atoms of said hydride-substituted organopolysiloxane and the unsaturated hydrocarbon radicals of said alkenyl-substituted organopolysiloxane polymer or said polyimide, said elastomer having a number-average molecular weight of 1,000 to 1,000,000, and wherein said polyimide has the formula:
- R.sup.12 --R.sup.10 --(Ar--R.sup.11).sub.p --R.sup.13
- wherein,
- Ar is naphthyl or ##STR9## X is CH.sub.2, O, S, SO, SO.sub.2, CO, or a bridging bond;
- p is 1-4;
- q is 0-3;
- R.sup.10 and R.sup.11 independently represent a diradical of the formula:
- ##STR10## wherein, Ar.sup.1 has the structure:
- ##STR11## wherein, R.sup.15 is O, S, CO, SO, or C(CF.sub.3).sub.2 ;
- Y and Z are independently O or N-- provided that when one of Y or Z is O the other is N--;
- R.sup.12 and R.sup.13 are independently R.sup.14 --Ar.sup.2, and R.sup.12 and R.sup.13 can be the same or different;
- R.sup.14 is ethynyl or vinyl;
- Ar.sup.2 is phenyl, naphthyl, or ##STR12## and X.sup.1 is O, S or C(CF.sub.3).sub.2.
15 more elements
A process for preparing an addition-cured silicone elastomer comprising the steps of:
- forming a mixture comprising about 10 to 30 weight percent of a hydride-substituted organopolysiloxane polymer containing at least three hydride groups, about 5 to 15 weight percent of a lower alkenyl-substituted organopolysiloxane polymer, about 1 to 5 weight percent of a polyimide substituted with terminal aliphatic unsaturated hydrocarbon radicals, about 50 to 75 weight percent of a filler, and a Group VIII metal catalyst;
- and
- reacting said mixture under conditions suitable to crosslink the hydride-bearing silicon atoms of said organopolysiloxane with the unsaturated hydrocarbon radicals of said alkenyl-substituted organopolysiloxane polymer or said polyimide, wherein said polyimide has the formula:
- R.sup.12 --R.sup.10 --(Ar--R.sup.11).sub.p --R.sup.13
- wherein,
- Ar is naphthyl or ##STR16## X is CH.sub.2, O, S, SO, SO.sub.2, CO, or a bridging bond;
- p is 1-4;
- q is 0-3;
- R.sup.10 and R.sup.11 independently represent a diradical of the formula:
- ##STR17## wherein, Ar.sup.1 has the structure:
- ##STR18## wherein, R.sup.15 is O, S, CO, SO, or C(CF.sub.3).sub.2 ;
- Y and Z are independently O or N-- provided that when one of Y or Z is O the other is N--;
- R.sup.12 and R.sup.13 are independently R.sup.14 --Ar.sup.2, and R.sup.12 and R.sup.13 can be the same or different;
- R.sup.14 is ethynyl or vinyl;
- Ar.sup.2 is phenyl, naphthyl, or ##STR19## and X.sup.1 is O, S or C(CF.sub.3).sub.2.
12 more elements
Dependencies are inferred from the claim text.