Asbestos-free microdenier acrylic fiber reinforced material for gaskets and the like
AssigneeAmerican Cyanamid Company
InventorsStanley S. Kaminski, Robert E. Evans
Life of this patent
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Abstract
Improved asbestos-free fiber reinforced material for use in the manufacture of gaskets, and the like, comprises (a) an elastomeric binder material and (b) microdenier acrylic fibers with a small diameter of up to about 12 microns, and a minimum aspect ratio in the 20-50 range so as to enhance the flexibility and the strength of the gaskets, shock mountings, timing belts, sealants, and the like, made from such materials.
Claims40
An asbestos-free fiber reinforced material comprising:
- (a) an elastomeric matrix composition;
- and
- (b) an effective reinforcing amount of acrylic fibers with a small diameter of less than about 12 microns, a length ranging from about 0.5 to about 3 mm, and having a minimum aspect ratio (L/D) in the 20-50 range, so as to provide enhanced strength and flexibility to gaskets, tires, timing belts, power transmission couplings, shock absorbers, sealants, and the like, made therefrom.
An asbestos-free composition adapted for use in gaskets, said composition comprising:
- (a) an curable elastomeric resin and a curative therefore, alone, or in further combination with:
- (i) a pigment,
- (ii) a dye,
- (iii) a heat stabilizer,
- (iv) an antioxidant,
- (v) a plasticizer,
- (vi) a lubricant,
- (vii) a UV-stabilizer,
- (viii) a flame-retardant agent,
- (ix) a processing aid,
- (x) a foaming agent,
- (xi) a filler,
- (xii) non-acrylic organic fibers and pulps,
- (xiii) inorganic fibers selected from glass, ceramic, mineral fibers, and the like, or
- (xi) a mixture of any of the foregoing, and
- (b) an effective concentration of a reinforcement for said composition, said reinforcement comprising microdenier acrylic fibers with a small diameter of less than 12 microns, a minimum length in the range or 0.5-3 mm, and a minimum aspect ratio (L/D) in the 20-50 range so as to provide a gasket with increased elongation in comparison with those made from corresponding acrylic fibers having a diameter of greater than 12 microns.
An asbestos-free gasket forming composition comprising in weight parts per 100 parts of the total fiber and filler weight about 5 to 25 parts of microdenier acrylic fibers with a small diameter of less than 12 microns, a minimum length in the range or 0.5-3 mm, and a minimum aspect ratio (L/D) in the 20-50 range, alone, or in further combination with about 10 to 25 parts of other fibers;
- about 40 to 70 parts of at least one inorganic filler;
- and 10 to 40 parts added-on of a synthetic rubber binder.
Dependencies are inferred from the claim text.