Friction material having heat-resistant paper support bearing resin-bonded carbon particles
First Claim
1. A friction member which is especially useful as a friction facing member in a transmission, said friction member comprising:
- (a) a uniform density heat resistant paper;
(b) a first layer of thermoset polymeric binder coated over and at least partially impregnated into one major surface of the paper;
(c) granular carbon friction particles uniformly distributed over and partially embedded in the exposed surface of the first layer; and
(d) a second layer polymeric binder as defined in (b) over the first layer and the partially embedded granular carbon friction particles which coats without obscuring the granular carbon friction particles.
1 Assignment
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Accused Products
Abstract
A friction member which is suitable for use as a friction facing member in a transmission is provided. the friction member includes a uniform density heat resistant paper, a first layer of thermoset polymeric binder coated over and at least partially impregnated into one major surface of the paper, granular carbon friction particles uniformly distributed over and partially imbedded in the exposed surface of the first layer and a second layer of thermoset binder over the first layer and partially imbedded granular friction particles which coats without obscuring the granular friction particles. The friction member is made by applying a coating if liquid thermosettable binder filled with carbon particles to one major surface of the paper, supporting the coated paper and a movable carrier, applying a uniform layer of carbon friction particles over the binder layer, at least partially curing the binder layer, applying a second coating of thermosettable binder material over the carbon particles and curing the coatings until the binder material is thermoset.
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Citations
12 Claims
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1. A friction member which is especially useful as a friction facing member in a transmission, said friction member comprising:
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(a) a uniform density heat resistant paper; (b) a first layer of thermoset polymeric binder coated over and at least partially impregnated into one major surface of the paper; (c) granular carbon friction particles uniformly distributed over and partially embedded in the exposed surface of the first layer; and (d) a second layer polymeric binder as defined in (b) over the first layer and the partially embedded granular carbon friction particles which coats without obscuring the granular carbon friction particles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. Method of making a friction member, said method comprising the steps of:
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(a) applying a coating of a liquid coating composition comprising thermosettable binder material filled with carbon filler particles to one major surface of a continuous length of uniform density, heat resistant paper under viscosity conditions which cause the coating composition to coat and impregnate the coated surface of the paper; (b) supporting the coated paper on a movable carrier; (c) applying a uniform layer of granular carbon friction particles over the coating of step (a) while the coating is sufficiently uncured so that at least some of the granular carbon friction particles become partially embedded into the coating; (d) at least partially curing the coating after application of the granular carbon friction particles; (e) applying a coating of a coating composition as defined in (a) over the partially cured coating; and (f) curing the coatings until the binder material is thermoset.
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12. A transmission which includes a friction facing member to transmit torque to another member by contact therewith, said friction facing member comprising:
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(a) a uniform density heat resistant paper; (b) a first layer of thermoset polymeric binder coated over and at least partially impregnated into one major surface of the paper; (c) granular carbon friction particles uniformly distributed over and partially embedded in the exposed surface of the first layer; and (d) a second layer polymeric binder as defined in (b) over the first layer and the partially embedded granular carbon friction particles which coats without obscuring the granular carbon friction particles.
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Specification