Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1988-08-08
1991-02-26
Carrillo, Ana L.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428367, 428392, 428408, 4284735, 525421, 525426, 525432, 525903, B32B 2704, D03D 300
Patent
active
049961012
ABSTRACT:
Semi-interpenetrating polymer networks having improved processibility and compatibility are prepared by combining a linear polymer comprised of a thermoplastic polyisoimide and a short chain thermosetting polymer in the form of a cross-linkable oligomer comprised of a thermosetting imide or isoimide oligomer containing unsaturated terminal groups, e.g., an acetylene-, a maleimide-, a nadimide- or a benzocyclobutene-terminated imide or isoimide oligomer. In the resulting blend at least one of the diamine and dianhydride moieties of the structural backbone unit of the polyisoimide and of the cross-linkable oligomer are the same, and preferably both of the components of the blend have the same structural backbone unit. An example of a preferred semi-interpenetrating polymer network is the combination of (1) the polyisoimide produced by reaction of benzophenonetetracarboxylic dianhydride (BTDA) with 1,3-bis (3-amino-phenoxy)benzene (APB) to form the polyamic acid precursor, followed by cyclodehydration thereof, and (2) the acetylene-terminated isoimide oligomer containing BTDA-APB backbone units and marketed as Thermid IP-600 by National Starch Company. Upon curing such semi-interpenetrating network or blend, a polymer having high toughness and high modulus is obtained.
REFERENCES:
patent: 4613637 (1986-09-01), Landis et al.
patent: 4695610 (1987-09-01), Egli
patent: 4847333 (1989-07-01), Lubowitz et al.
patent: 4851495 (1989-07-01), Sheppard et al.
Landis Abraham L.
Lau Kreisler S. Y.
Carrillo Ana L.
Geldin Max
Lockheed Corporation
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