Fluororubber molded article and method for producing the same

• US 20040171714A1
• Filed: 02/27/2004
• Published: 09/02/2004
• Est. Priority Date: 02/28/2003
• Status: Active Grant

• Current Assignee: Nichia Corporation
• Original Assignee: Nichia Corporation
• Inventors: Saito, Masayuki, Kuzawa, Naoya, Ogura, Hitoshi, Nakano, Mitsuyuki
• Granted Patent: US 7,220,788 B2
• Time in Patent Office: Days
• US Class Current: 522/117
• CPC Class Codes: C08J 2327/12 containing fluorine atoms
• CPC Class Codes: C08J 3/28 Treatment by wave energy or particle radiation
• CPC Class Codes: C08L 2666/14 Macromolecular compounds according to C08L59/00 - C08L87/00; Derivatives thereof
• CPC Class Codes: C08L 27/18 Homopolymers or copolymers or tetrafluoroethene
• CPC Class Codes: C08L 61/26 of aldehydes with heterocyclic compounds

Abstract

The present invention relates to a fluororubber molded article obtained by subjecting a fluororubber composition to crosslinking by irradiation of ionizing radiation, wherein the fluororubber composition comprises: (i) a raw rubber having a metal element content of 1.5% or less and comprising a tetrafluoroethylene-propylene copolymer; and (ii) a prepolymer of triallyl isocyanurate. Also disclosed is a method for producing the fluororubber molded article.

Claims

1. A fluororubber molded article obtained by subjecting a fluororubber composition to crosslinking by irradiation of ionizing radiation,

wherein said fluororubber composition comprises:

(i) a raw rubber having a metal element content of 1.5% or less and comprising a tetrafluoroethylene-propylene copolymer; and

(ii) a prepolymer of triallyl isocyanurate.

2. The fluororubber molded article according to claim 1, wherein said fluororubber composition contains said triallyl isocyanurate prepolymer in an amount of 5 to 50 parts by weight per 100 parts by weight of the raw rubber.

3. The fluororubber molded article according to claim 1, wherein the molded article is further subjected to heat treatment at a temperature of 50 to 300°

C. for 0.1 to 10 hours.

4. A method for producing a fluororubber molded article, which comprises the steps of:

(A) providing a fluororubber composition comprising;

(i) a raw rubber having a metal element content of 1.5% or less and comprising a tetrafluoroethylene-propylene copolymer; and

(ii) a prepolymer of triallyl isocyanurate;

(B) preforming said fluororubber composition into a predetermined form in a heated atmosphere; and

(C) subjecting said preformed product to crosslinking by irradiation of ionizing radiation.

5. The method according to claim 4, further comprising heating said crosslinked product at a temperature of 50 to 300°

C. for 0.1 to 10 hours.