Stock material or miscellaneous articles – Composite – Of polyamidoester
Patent
1995-03-27
1997-11-04
Lee, Helen
Stock material or miscellaneous articles
Composite
Of polyamidoester
4284247, 4284248, B32B 2700
Patent
active
056838158
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a sheet or a molding of a multi-phase thermoplastic comprising an elastomer-modified thermoplastic, one or more modifiers and, if desired, processing aids, coloring agents, stabilizers and other usual additives, as well as the use of the sheet to produce a composite sheet.
Sheets containing an elastomer-grafted styrene-acrylonitrile copolymer (ASA) are known from German Laid-Open Patent 34 29 523. These sheets contain as the modifiers chlorinated polyethylene (PEC), rubber-like ethylene-propylene copolymer (EPM) and/or a rubber-like terpolymer of ethylene, propylene and a diene (EPDM). The weight ratio of ASA to the particular modifier or mixture is from 8:2 to 3:7. It has been found that the EPM and EPDM are not as compatible with the ASA as would be desired. An undesired separation can occur during further processing. The particular disadvantage of the PEC is its chlorine content. Therefore it has been avoided for some time with respect to environmental protection.
German Laid-Open Patent 40 19 799 concerns sheets used especially as leather substitutes. They contain a thermoplastic polyurethane (A) and at least one partially cross-linked alkyl acrylate copolymer (B) of (B1) a C.sub.1 -C.sub.6 -alkylacrylate and (B2) acrylonitrile, styrene, vinyl acetate.
With respect to an analysis of the state of the technology and the consequences arising from it, the objective of this invention was to find polymeric and monomeric external plasticizers and also, if desired, hardening components for a sheet of the type described initially, which have the lowest possible crystallinity or are, in particular, amorphous, but which are specifically miscible with ASA. That should, especially, cause a reduction of the Shore Hardness D and the E-modulus in order to retain the most pleasant possible feel of the sheet. If monomeric external plasticizers are used they should be resistant to migration and should, if possible, have no effect on the fogging phenomenon that occurs when such sheets are used in vehicle interiors. Quite specifically, the invention focuses on the desired sheets or moldings having improved E-modulus and tear strength as compared with the state of the technology. Such a sheet would be intended for use primarily as a PVC substitute, whereby the specifications required in each case should be easily adjustable.
This objective is achieved according to the invention by the elastomer-modified thermoplastic being an acrylonitrile-styrene-acrylic ester copolymer (ASA) with an acrylic ester proportion of about 25 to 80% by weight, and the desired hardness or softness of the ASA copolymer being controlled by incorporating a modifier, whereby the modifier incorporated into the ASA copolymer of and/or crystallinity not greater than 25% in the form of an ethylene-vinyl acetate copolymer (EVA), and ethylene-ethyl acrylate copolymer (EEA), an ethylene-butyl acrylate copolymer (EBA), a hydrogenated or non-hydrogenated styrene-butadiene-styrene block copolymer (SEBS or SBS) and/or a soft acrylonitrile-styrene-acrylic ester copolymer (ASA) having an acrylic ester proportion of about 70 to 80% by weight, whereby the mixing ratio (weight/weight) of hard elastomer-modified acrylonitrile-styrene-acrylic ester copolymer (ASA) to the external plasticizer is from about 9:1 to 1:1, and sufficiently compatible with the ASA copolymer and having an E-modulus of .gtoreq.2,000 N/mm.sup.2, whereby the mixing ratio of soft ASA copolymer to the hardening copolymer is from about 20:1 to 1:1.
Modification variation (1) will be described in detail in the following.
Within the framework of the invention, two different acrylonitrile-styrene-acrylic ester copolymers (ASA) can be used. In the following we speak of "elastomer-modified ASA" in the case of the elastomer-modified thermoplastic and of the ASA modifier in the case of ASA used as a modifier.
The mixing ratio of elastomer-modified ASA to the specified modifiers, in the case when a soft sheet is desired, is more toward the lower limit of about 1:1, particularly betwe
REFERENCES:
patent: 5248546 (1993-09-01), Greenlee
patent: 5334450 (1994-08-01), Zabrocki et al.
patent: 5409986 (1995-04-01), Boudry et al.
patent: 5415940 (1995-05-01), Ngoc et al.
Benecke-Kaliko AG
Lee Helen
LandOfFree
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