Melt formed from polyurethane and/or polyurethane urea elastomer

Details Melt formed from polyurethane and/or polyurethane urea elastomer Melt formed from polyurethane and/or polyurethane urea elastomer

1995-04-18

1996-12-10

Seidleck, James J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

528 45, 528 52, 528 59, 528 61, 528 64, 528 65, 528 73, C08G 1838, C08K 520

Patent

active

055831966

ABSTRACT:
A polyurethane and/or polyurethane urea elastomer in the form of a thermostable processable melt, which is immediately processable or which, after cooling and storing, can be remelted and processed. The elastomer is produced by a polyaddition or build-up reaction of longer chain diols with diisocyanate, chain extenders and a polar gelling and/or melting aid for the formation of the thermostable processable melt. A method for manufacturing a polyurethane and/or polyurethane-urea elastomer in the form of a thermally stable processable melt which may be processed immediately or after cooling and storage, being remeltable and reprocessable. The method comprises the steps of: converting n-Mol of a polymeric diol to form a prepolymer with about 1.1 to about 10.0 n-Mol of a diisocyanate at about 50.degree. C. to about 150.degree. C.; adding to the prepolymer between about 1% to about 25% by mass, relative to the prepolymer, of: a polar gel and/or melt auxiliary agent selected from the group consisting of open-chain protic-carboxylic acid amide compounds, cyclic protic carboxylic acid amide compounds and mixtures thereof; and a chain lengthener to form a polymer; heating the polymer to between about 120.degree. C. and about 230.degree. C.; and cooling the polymer.

REFERENCES:
patent: 3245961 (1966-04-01), Fetscher et al.
patent: 3557044 (1971-01-01), Bleasdale et al.
patent: 3565894 (1971-02-01), D'Amico
patent: 3668185 (1972-06-01), Boutsicaris
patent: 3721656 (1973-03-01), Ikeda et al.
patent: 3822240 (1974-07-01), Schmitt et al.
patent: 3933759 (1976-01-01), Hoeschele
Encyclopedia of Polymer Science and Engineering, vol. 6, 733, 1986, J. Wiley & Sons.
Kolloid-Z. U. Z. Polymere, 241, 1970, pp. 909-915.

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