EP0062408A1 — A curable organopolysiloxane composition for heat…

Claim 1

Independent Claim 380 words

A heat fixing roll for pressure fusing electrophotographic dry toner powder comprising a core roll substrate with an outer layer of silicone rubber, optionally having a priming layer adhering the silicone rubber to the core roll substrate, said silicone rubber being the cured product of a composition consisting essentially of (A) 100 parts by weight of a polyorganosiloxane expressed by the average unit formula wherein R is a monovalent radical selected from the group consisting of an alkyl radical of 1 to 8 inclusive carbon atoms, phenyl radical, and 3,3,3-trifluoropropyl radical, R' is an aliphatically unsaturated hydrocarbon radical selected from the group consisting of vinyl radical and allyl radical, a has a value of 1.90 to 2.05, b has a value of 0.0005 to 0.1, and the sum of a + b has a value of 1.91 to 2.06, and the polyorganosiloxane having a viscosity at 25°C in the range of from 0.1 to 100 Pa's, (B) an amount of a polyorganohydrogensiloxane sufficient to provide 0.5 to 10 silicon-bonded hydrogen atoms per aliphatically unsaturated hydrocarbon radical in (A), the polyorganohydrogensiloxane being expressed by the average unit formula wherein R is as defined above, c has a value of 1.0 to 2.1, d has a value of 0.001 to 1.0, and the sum of c + d has a value of 1.001 to 3, and the polyorganohydrogensiloxane having a viscosity at 25°C in the range of 0.001 to 5 Pa's, and characterized in that said silicone rubber contains (C) 50 to 250 parts by weight of a siliceous filler of which at least 10 parts by weight is a reinforcing silica filler, said siliceous filler being surface treated, (D) 0 to 100 parts by weight of a triorganosiloxy endblocked polydiorganosiloxane in which the organic radicals are the same as defined for R and the polydiorganosiloxane has a viscosity at 25°C in the range of from 0.01 to 5 Pa's, (E) an amount of a platinum group catalyst sufficient to provide from 1 to 800 parts by weight platinum group metal per one million parts by weight of the total weight of (A), (B), (C) , and (D), and (F) optionally a platinum group catalyst retardant, where the composition has a viscosity at 25°C in the range of 2 to 10,000 Pa•s.

Claim 2

Dependent Claim 380 words

A heat fixing roll for pressure fusing electrophotographic dry toner powder comprising a core roll substrate with an outer layer of silicone rubber, optionally having a priming layer adhering the silicone rubber to the core roll substrate, said silicone rubber being the cured product of a composition consisting essentially of (A) 100 parts by weight of a polyorganosiloxane expressed by the average unit formula wherein R is a monovalent radical selected from the group consisting of an alkyl radical of 1 to 8 inclusive carbon atoms, phenyl radical, and 3,3,3-trifluoropropyl radical, R' is an aliphatically unsaturated hydrocarbon radical selected from the group consisting of vinyl radical and allyl radical, a has a value of 1.90 to 2.05, b has a value of 0.0005 to 0.1, and the sum of a + b has a value of 1.91 to 2.06, and the polyorganosiloxane having a viscosity at 25°C in the range of from 0.1 to 100 Pa's, (B) an amount of a polyorganohydrogensiloxane sufficient to provide 0.5 to 10 silicon-bonded hydrogen atoms per aliphatically unsaturated hydrocarbon radical in (A), the polyorganohydrogensiloxane being expressed by the average unit formula wherein R is as defined above, c has a value of 1.0 to 2.1, d has a value of 0.001 to 1.0, and the sum of c + d has a value of 1.001 to 3, and the polyorganohydrogensiloxane having a viscosity at 25°C in the range of 0.001 to 5 Pa's, and characterized in that said silicone rubber contains (C) 50 to 250 parts by weight of a siliceous filler of which at least 10 parts by weight is a reinforcing silica filler, said siliceous filler being surface treated, (D) 0 to 100 parts by weight of a triorganosiloxy endblocked polydiorganosiloxane in which the organic radicals are the same as defined for R and the polydiorganosiloxane has a viscosity at 25°C in the range of from 0.01 to 5 Pa's, (E) an amount of a platinum group catalyst sufficient to provide from 1 to 800 parts by weight platinum group metal per one million parts by weight of the total weight of (A), (B), (C) , and (D), and (F) optionally a platinum group catalyst retardant, where the composition has a viscosity at 25°C in the range of 2 to 10,000 Pa•s.

Claim 3

Dependent Claim 106 words

The heat fixing roll according to claim 1 in which the polyorganosiloxanc of (A) is a dimethylvinylsiloxy endblocked polydimethylsiloxane having a viscosity in the range of 0.1 to 50 Pa's, the polyorganohydrogensiloxane of (B) is a polymethylhydrogensiloxane, the siliceous filler of (C) is a mixture of 15 to 50 parts by weight reinforcing silica, 40 to 160 parts by weight quartz filler, and 0 to 60 parts by weight diatomaceous earth, said siliceous filler being insitu treated with hexamethyldisilazane, the polydiorganosiloxane (D) is a trimethylsiloxy endblocked polydimethylsiloxane, the platinum group catalyst of (E) is a platinum catalyst, and the retardant of (F) is an acetylenic alcohol.

A curable organopolysiloxane composition for heat fixing rolls

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