Silicone rubber roll

Details Silicone rubber roll Silicone rubber roll

1994-05-20

1996-12-10

Bleutoe, John C.

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

428 3692, 428447, 492 59, 492 58, 492 54, 492 56, 492 53, B32B 108, B25F 100

Patent

active

055828850

ABSTRACT:
A silicone rubber roll is characteristically prepared on a metallic center by forming a layer of the cured product of a silicone rubber composition which comprises (A) organopolysiloxane, in which the total amount of low molecular weight siloxanes having a degree of polymerization ranging from 3 to 20 is controlled to be at most 10,000 ppm, (B) reinforcing silica powder with a specific surface area of at least 50 m.sup.2 /g, (C) silicone elastomer particles with an average particle size of 200 .mu.m, in which the total amount of low molecular weight siloxanes having a degree of polymerization ranging from 3 to 20 is 2,000 ppm or less, and (D) a curing agent. The total amount of low molecular weight siloxanes having a degree of polymerization ranging from 3 to 20 within the cured product layer is controlled to be 2,000 ppm or less, since the elimination of the low molecular weight siloxanes having a degree of polymerization ranging from 3 to 20 proceeds effectively during the processes of the silicone rubber composition preparation, forming, and curing. Therefore, the obtained roll is extremely useful for various types of rolls utilized in copying machines which particularly need to avoid the low molecular weight siloxanes.

REFERENCES:
patent: 4603087 (1986-07-01), Ema et al.
patent: 4761454 (1988-08-01), Oba et al.
patent: 4977308 (1990-12-01), Soga
English Abstract of JP 61158362.

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