Resin composition for spacers of information recording disc

Details Resin composition for spacers of information recording disc Resin composition for spacers of information recording disc

C - Chemistry, Metallurgy

08

L

18/1132, 400/933

C08L 23/08 (2006.01) B29C 65/08 (2006.01) C08J 5/12 (2006.01) C08K 3/00 (2006.01) C08K 3/36 (2006.01) G11B 7/24 (2006.01)

Patent

CA 1333514

A resin composition for spacers of an information recording disc which comprises: (A) a random copolymer of ethylene and at least one cycloolefin having an intrinsic viscosity [?] of from 0.05 to 10 dl/g, as measured in decalin at a temperature of 135°C., and (B) from 0.01 to 5 parts by weight, based on 100 parts by weight, of said copolymer A, of an inorganic particles such as titania and silica having a particle size of not more than 300µm. Spacers made of the composition described herein can be welded to disc substrates within a shortened period of ultrasonic vibration to produce an information recording disc having a reduced warp angle.

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