Method of reclaiming cured polyurethane elastomers

Details Method of reclaiming cured polyurethane elastomers Method of reclaiming cured polyurethane elastomers

1974-09-23

1976-05-04

Briggs, Sr., Wilbert J.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 292TN, 260 334UR, 260 75N, 260 775A, 260 775AN, C08J 1104, C08G 1882

Patent

active

039546810

ABSTRACT:
A novel method of reclaiming cured polyurethane elastomers comprises milling particulate cured polyurethane elastomer under shear sufficient to increase the temperature of the elastomer for a time sufficient to form the elastomer into a cohesive mass and then continuing the milling at elevated temperature and pressure in the presence of a selected devulcanizing agent until a uniform, continuous, cohesive, partially devulcanized product is obtained. The novel product has properties which are improved over those of the cured starting material including improved heat resistance, abrasion resistance and tensile strength.

REFERENCES:
patent: 2494593 (1950-01-01), Sverdrup
Rubber Chemistry & Technology, Vol. 39, No. 4, Part II (1966) pp. 1328-1337, Magnus et al., Stability of Urethane Elastomers in Water, etc.
Rubber Age, Vol. 96, Feb. 1965, pp. 705-712, Athey, R. J., Water Resistance of Liquid Urethane Vulcanizates.

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