Pressure-resistant polyurethane-polyurea particles for the encap

Details Pressure-resistant polyurethane-polyurea particles for the encap Pressure-resistant polyurethane-polyurea particles for the encap

1978-12-19

1980-10-28

Cockeram, H. S.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

260 292TN, 521 51, 521114, 521130, 528 48, 528902, 424 16, C08G 1814, C08G 1808

Patent

active

042308097

ABSTRACT:
Pressure-resistant polyurethane-polyurea particles with textured internal mass prepared from a liquid phase immiscible with water and containing organic solvents, isocyanate prepolymers and optionally active substances or mixtures of active substances, the liquid phase being dispersed in an aqueous phase at temperatures of from 0.degree. C. to 95.degree. C., wherein the liquid organic phase contains as isocyanate prepolymer a reaction product of a stoichiometric excess of an aliphatic, aromatic, cycloaliphatic, or araliphatic di- or polyisocyanate with a di- or polyol, the reaction product having a mean molecular weight in the range of from about 300 to 10,000, and an alkyl and/or alkoxyalkyl acetate of the formula ##STR1## in which m is zero, 1 or 2, n is 1 to 4, and R is (C.sub.1 -C.sub.5)alkyl, and the aqueous phase contains a protective colloid and optionally a surface-active agent.

REFERENCES:
patent: 3402149 (1968-09-01), Walters
patent: 3577515 (1971-05-01), Vandegaer
patent: 3651182 (1972-03-01), Rosenthal
patent: 3850880 (1974-11-01), Hakanson et al.
patent: 3860565 (1975-01-01), Barber
patent: 3963710 (1976-06-01), Aufdermarsh
patent: 4000218 (1976-12-01), Critchfield et al.
patent: 4032516 (1977-06-01), McGarr
patent: 4046741 (1977-09-01), Scher
DAS 1817316, Watanabe et al., Dec. 18, 1969.
DAS 2043556, Matsukawa et al., Mar. 25, 1971.
DOS 2242910, Kiritani et al., Mar. 15, 1973.
DOS 2251381, Kiritani et al., Apr. 26., 1973.
DOS 2311712, Schnoring et al., Sep. 19, 1974.
DOS 2312059, Scher, Sep. 20, 1973.
DOS 2404538, Schnoring et al., Aug. 7, 1975.
DOS 2557407, Schnoring et al., Jun. 30, 1977.

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