Method of inhibiting plasticizer migration from plasticized poly

Details Method of inhibiting plasticizer migration from plasticized poly Method of inhibiting plasticizer migration from plasticized poly

1976-11-18

1977-08-30

Lusignan, Michael R.

Coating processes

With post-treatment of coating or coating material

Heating or drying

427385B, 427407F, 428424, 428425, 428500, 428904, 260 775AT, B32B 2730, D06N 304, B44D 114

Patent

active

040456005

ABSTRACT:
Migration of plasticizer from plasticized PVC substrate is inhibited by coating the surface of the substrate by the steps of (1) applying to the surface of the plasticized polyvinyl chloride a solution consisting essentially of an inert organic solvent and an isocyanate-terminated polyurethane, said coating having a viscosity of from about 50 to 200 centipoise; (2) removing the organic solvent from the applied solution wherein a first substantially homogeneous film of thermosettable polyurethane is formed of from about 1.0 to 2.0 mils in thickness; (3) applying to the substantially homogeneous film surface of Step 2 said coating composition of Step 1; (4) removing said organic solvent from the applied solution of Step 3 wherein a second substantially homogeneous film of a thermosettable polyurethane is formed of from 2.0 to 3.0 mils in thickness; (5) repeating Steps 1 and 2 wherein said coating solution is applied to the surface of the substantially homogeneous film of Step 4 to form a third substantially homogeneous film of a thermosettable polyurethane of from about 1.5 to 3.0 mils in thickness; thereby inhibiting plasticizer migration from the polyvinyl chloride substrate to the third substantially homogeneous film.

REFERENCES:
patent: 3669717 (1972-06-01), Alcamatsu et al.
patent: 3892895 (1975-07-01), Togoo et al.

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