Laminates joined by polyurethane hot-melt adhesive and process for bonding plasticizer-containing plastics
AssigneeSika Technology AG
InventorsKai Paschkowski, Doreen Scheidler, Urs Burckhardt, Mario Slongo
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Abstract
The present invention relates to laminates of a plasticizer-containing plastic, obtained by bonding by means of a moisture-reactive hot-melt adhesive which comprises at least one aldimine and at least one polyurethane polymer which contains isocyanate groups and is solid at room temperature. The bonded assembly is notable for improved adhesive, particularly following heat/moisture storage or alternating storage. Preferred embodiments of such laminates are bonded films or film-laminated supports, the film preferably being a pPVC film.
Claims39
Laminate having
- a) at least one substrate S1;
- b) at least one hot-melt adhesive K comprising
- at least one polyurethane polymer P which contains isocyanate groups and is solid at room temperature, and
- at least one aldimine A;
- c) at least one substrate S2,
- the substrate S1 and/or the substrate S2 being a plasticizer-containing plastic, the substrate S1 and/or the substrate S2 having been pretreated, where appropriate, with a primer;
- and
- the substrate S1 being joined to the substrate S2 via the hot-melt adhesive K.
Process for the adhesive bonding of a plasticizer-containing plastic, comprising the steps of
- i) melting a hot-melt adhesive K
- ii) applying the melted hot-melt adhesive K to a substrate S1
- iii) contacting the surface of a substrate S2 with the hot-melt adhesive K within its open time;
- or
- i′) melting a hot-melt adhesive K
- ii′) applying the melted hot-melt adhesive K to a substrate S1
- iii′) cooling the hot-melt adhesive K to room temperature
- iv′) melting the hot-melt adhesive K located on the substrate S1
- v′) contacting the surface of a substrate S2 with the hot-melt adhesive K;
- or
- i″) melting a hot-melt adhesive K
- ii″) applying the melted hot-melt adhesive K into a gap confined laterally substantially by the surfaces of the substrate S1 and the substrate S2;
- at least one of the substrates S1 or S2, being a plasticizer-containing plastic and the substrate S1 being composed of the same material as or a different material to the substrate S2;
- and the hot-melt adhesive K comprising at least one aldimine A and at least one polyurethane polymer P which contains isocyanate groups and is solid at room temperature.
Dependencies are inferred from the claim text.