Process for preparing high tear-strength polydiene polyurethane

Details Process for preparing high tear-strength polydiene polyurethane Process for preparing high tear-strength polydiene polyurethane

1976-08-31

1977-10-11

Cockeram, H.S.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 775CR, 260 775AP, 528480, 528487, 260 775AM, C08G 1862, C08K 304

Patent

active

040534464

ABSTRACT:
Polydiene polyurethanes having high tear strength are obtained by using polydiene glycols, prepared with use of lithium-based catalyst, having a number average molecular weight of 1,000 to 5,000 and functionality of 1.8 - 2.1, diisocyanates and chain-extending agents, and by controlling chemical cross-link density being 4 .times. 10.sup.-5 mole/cc and less. When the chemical cross-link density is within the above range, elongation and tensile strength in addition to tear strength of the polyurethane are improved significantly. Furthermore, when 10 - 50 parts by weight of the specified carbon black are added to 100 parts by weight of the mixture of the prepolymer, the chain-extending agent and the additive prior to curing the prepolymer, these mechanical properties of the polyurethane are improved further.

REFERENCES:
patent: 3135716 (1964-06-01), Uraneck et al.
patent: 3177190 (1965-04-01), Hsieh
patent: 3607976 (1971-09-01), Hsieh et al.
patent: 3966668 (1976-06-01), Cain
Kirk-Othmer, Encyclopedia of Chemical Technology, vol. 4, p. 255.
Krause et al., Rubber Chemistry and Technology, 41, 1305 (1968).

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