Patent EP0320533A1 successfully refreshed from Google Patents.
EP0320533A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Roll covered with silicone material and method for producing same
Assignee: DuPont Toray Specialty Materials KK
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Filing: 1987-12-18
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Granted: —
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Expires: 2007-12-18
Abstract
Abstract This invention provides a silicone elastomer-covered roll consisting essentially of a central roll axle that is in contact with an inner layer of cured silicone elastomer having a hardness value no greater than 30 on the JIS A scale and an outer layer of cured silicone material having a hardness in excess of that of the inner layer. The roll is resistant to assuming a permanent compression set during use, in addition to exhibiting excellent soiling resistance. In particular, when used as a fixing roll in an electrophotographic copier, the contact area with the hard roll can increase, resulting in a clear image on the copy paper.
Inventors
- 👤 Koji Shimizu
- 👤 Keiji Yoshida
- 👤 Mitsuo Hamada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 23:11
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/14; G03G15/16; G03G15/1665; G03G15/167; G03G15/1685; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2053; G03G15/2057; G03G15/206; G03G21/00; G03G21/0005; G03G21/0058
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
81 words
A roll covered with silicone material, said roll comprising a roll axle coated with an inner layer of elastomeric cured silicone material having a hardness value of no greater than 30 on the Japanese Industrial Standards (JIS) A scale, where the lower surface of said layer is in contact with said axle and the upper surface of said layer is in contact with an outer layer of a cured silicone material exhibiting a hardness greater than that of said inner layer.
Claim 2
Dependent Claim
81 words
A roll covered with silicone material, said roll comprising a roll axle coated with an inner layer of elastomeric cured silicone material having a hardness value of no greater than 30 on the Japanese Industrial Standards (JIS) A scale, where the lower surface of said layer is in contact with said axle and the upper surface of said layer is in contact with an outer layer of a cured silicone material exhibiting a hardness greater than that of said inner layer.
Claim 3
Dependent Claim
81 words
A roll according to claim 1, where said roll is produced by coating the interior surface of a mold with an organopolysiloxane having at least 3 silicon-bonded hydrogen atoms in each molecule, mounting said roll axle in said mold, introducing into said mold a curable liquid silicone rubber composition that will yield said silicone material having a hardness value of no greater than 30 on the JIS A scale and curing said organopolysiloxane and said liquid silicone rubber composition by heating.
Claim 4
Dependent Claim
112 words
A roll according to claim 2 wherein the liquid silicone rubber composition comprises (A) an organopolysiloxane containing at least 2 silicon-bonded lower alkenyl radicals in each molecule: (B) an organopolysiloxane having at least 2 silicon-bonded hydrogen atoms in each molecule, in a quantity such that the molar ratio of the total quantity of silicon-bonded hydrogen atoms in the present component to the total quantity of all lower alkenyl groups in component (A) is from 0.1 to 1; and (C) a platinum-type catalyst in an amount equivalent to from 0.1 to 1,000 parts by weight of platinum metal for each one million parts by weight of the total of components (A) and (B).
Claim 5
Dependent Claim
29 words
A roll according to claim 3 where said lower alkenyl radical is vinyl and said organopolysiloxane having at least 2 silicon-bonded hydrogen atoms in each molecule is a polymethylhydrogensiloxane.
Claim 6
Dependent Claim
16 words
A roll according to claim 4 where said vinyl radicals are present in a dimethylvinylsiloxy-terminated polydimethylsiloxane.
References Cited (Backward Citations)
No citation records indexed.
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