Stock material or miscellaneous articles – Composite – Of polyamidoester
Patent
1999-02-12
2000-09-19
Weisberger, Richard
Stock material or miscellaneous articles
Composite
Of polyamidoester
4284231, 4273722, 427384, 427402, 528 80, 528 81, 528 83, 528 84, 4538, B32B 2700, B32B 2740, C08G 1834, C08G 1842
Patent
active
061209031
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a multilayer flat moulding with a visible or exposed side and a supporting layer, especially in the form of items of sanitary ware such as bathtubs or shower fittings. Multilayer flat mouldings according to the invention may in addition be used as internal and external linings and claddings, for example in dwellings, boat-building and the like.
BACKGROUND OF THE INVENTION
According to DE-A 4 223 993 it is known to fabricate the visible and used side of bathtubs and shower fittings from a thermoformed thermoplastic material, in particular polymethyl methacrylate, and to provide the rear side with a supporting polyurethane layer, the thermoformed moulding being used as a one-off mould for the polyurethane layer. The advantage of such articles of sanitary ware is that they can be recycled by separating the thermoplastic layer from the polyurethane layer simply by raising the temperature.
SUMMARY OF THE INVENTION
According to the invention it is now proposed to produce such multilayer, flat mouldings with a visible and optionally used side and a supporting layer, completely from polyurethane by first of all applying a substantially solvent-free polyurethane surface coating layer to a negative mould and then applying a polyurethane supporting layer to the still uncured polyurethane surface coating layer.
The present invention accordingly provides a multilayer, flat moulding having a visible side and a supporting layer, the visible side consisting of a polyurethane layer that has been obtained by curing a first mixture containing isophorone diisocyanate having a viscosity of 100 to 10 000 mPa.s and a NCO content of 5 to 30 wt. %, and a OH group content corresponding to a OH number of 33 to 1000, well as obtained by curing a second mixture containing polyol having a NCO content of 20 to 30 wt. %, fibres.
Suitable surface coating polyisocyanates based on 1,6-diisocyanatohexane (HDI) are understood to be in particular HDI derivatives of the type known per se containing allophanate, biuret, isocyanurate, oxadiazine, uretdione and/or urethane groups, and having the aforementioned characteristic properties. Suitable compounds are thus for example polyisocyanates containing uretdione and/or isocyanurate groups of the type disclosed in EP-A-O 010 589, -0 089 297, -0 173 252, -0 178 520, -0 330 966, -0 337 116, -0 377 177, -0 456 062 and -0 495 307 or in DE-OS 32 19 608 and 38 10 908; polyisocyanates containing biuret groups of the types mentioned in EP-A-O 150 769 and -0 320 703, in U.S. Pat. Nos. 3,903,127, 3,976,622 and 4,028,392 or in DE-OS 28 08 801, 30 30 655 and 31 33 865; polyisocyanates containing allophanate and optionally isocyanurate groups of the type mentioned in EP-A-0 000 194, -0 496 208, -0 524 500, -0 524 501 and -0 566 037; polyisocyanates containing oxadiazine groups of the type mentioned in DE-OS 16 70 666, or arbitrary mixtures of such polyisocyanates.
DETAILED DESCRIPTION OF THE INVENTION
Preferred are surface coating polyisocyanates with a uretdione or alophanate and/or isocyanurate structure, which have a viscosity of 100 to 1500 mPa.s at 23.degree. C. and a content of isocyanate groups of 17 to 24 wt. %, and a content of monomeric HDI of less than 0.5 wt. %.
Also suitable are surface coating isocyanates based on isophorone diisocyanate (IPDI) containing allophanate or isocyanurate groups, with a content of isocyanate groups of 10 to 25 wt. % and a content of monomeric diisocyanates of less than 0.5 wt. %.
The preparation of such isocyanurate group-containing polyisocyanates based on IPDI is known and is described for example in EP-A-0 003 765, -0 017 998 or -0 193 828 or in DE-OS 19 34 763 and 26 44 684.
Preferably surface coating polyisocyanates are used that contain between 10 and 60 wt. % of a biuret based on 1,6-diisocyanatohexane. The correct viscosity consistency for application is thereby lowered and the pot life is increased, and in addition curing is accelerated at elevated temperatures. The mixture of surface coating pol
Dederichs Reinhold
Hausmann Heinz
Petzoldt Joachim
Springer Elke
Baker Aktiengesellschaft
Cheung Noland J.
Gil Joseph C.
Weisberger Richard
Whalen Lyndanne M.
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