Semi-IPN polyurethane/polyurea protective films
Assignee3M Innovative Properties Company
InventorsRyan F. Marx, Gerald F. Fleischhacker
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Abstract
Briefly, the present disclosure provides a film, tape or outer layer of a composite part comprising: a) at least one layer comprising a crosslinked polymer selected from the group consisting of crosslinked polyurethane, crosslinked polyurea, and crosslinked mixed polyurethane/polyurea polymer; and in some embodiments b) an adhesive layer. In some embodiments the layer additionally comprises a non-crosslinked polymer forming a semi-IPN with the crosslinked polymer. In some embodiments the non-crosslinked polymer may be selected from the group consisting of polyurethane, polyurea, and mixed polyurethane/polyurea polymer. In some embodiments the crosslinked polymer may additionally comprise an acrylate-containing component.
Claims9
A method of making a part comprising the steps of:
- a) lining a mold with a film or tape which comprises a semi-interpenetrating network (semi-IPN) of:
- i) a crosslinked component derived from a urethane acrylate and
- ii) a non-crosslinked component which is a thermoplastic polyurethane;
- and
- b) performing a molding process such that after the molding process the resulting part has an outer surface of the film or tape.
Dependencies are inferred from the claim text.