MXPA97001691A - Compue plate - Google Patents

Abstract

The present invention relates to composite plate, from which, by deep drawing, a supplement can be manufactured for sanitary articles (bathtubs, shower panels, sinks, sinks), being arranged on a base, in particular acrylonitrile- butadiene-styrene (ABS) a coating of poly (methylene methacrylate) (PMMA, acrylic glass), characterized in that the acrylic glass coating consists of a mixture of PMMA with modified impact toughness and PMMA

Description

COMPOSITE PLATE The invention is based on a composite plate, < from which, by ernbMt ICJL? deep, it can be supplemented by a supplement for sanitary appliances, in tubs, bathtubs, showers, sinks, sinks, being arranged on a base, in particular of acp lon tri lo-butadieno -ost i reno (PIBS'p a revesa irnion + oe pol (metacp ato de met lo) (PUMA, vid i-icplico) Currently, paivi diverse supplements of sanitary articles (bathtubs, sinks, shower panels, shower panels) They use plastics made of synthetic acrylic material made by casting or AB / PMIA coextrusion plates The European standard EN 263 describes exactly the requirements and test methods that an acp plate made by casting for bathtubs has to fulfill. and showers for use dome t ico The requirements prescribed in the standard FN 263 (in addition to the general requirements required to the plate acpl ca made by casting in relation to the raw material empicada were hitherto only partially by part of plates coext ru AB days with a reverse poly (methyl methacrylate) (PUMA). The requirement according to the paragraph < 3 of the standard EN 263"Stability against hot water" has not yet been met with 100% safety by the HBS / PMMA c extrusions plates. fl r-? io joined the expeí ?, ???, that the prescribed recipe is not suf i i * * emente re list, in the sense that does not take into account the influence of l ^ aggressive solvents, allowed in some countries < cleaning agents components, on the stability of synthetic materials against < ? hot guide? For this reason, the applicant has developed a self-test in the development of ABS / PMMA coextr * u i plates for sanitary articles that, in the case of plates extruded according to the punctuation q d the EM 263 standard, still provides for a cleaning process with aggressive cleaning agents, common in the trade, in the different cycles. The invention that constitutes the object of this request is based on the recognition that this test It can be overcome when a chemical stability and a stability is present in front of > The hot water / f water is high enough in the polymer-based coating (methyl methane). It is known, moreover, that these requirements can be fulfilled by the PUNA covering layer, the better when the molecular weight of the raw material used is as high as possible. EP-B1-225500 of the applicant describes composite plates of ABS and a coating of PUMA for the manufacture of '' supplement of 5 tubs made by * deep drawing which are coext noises through a wide slot nozzle and which are characterized by the fact that the optical glass which forms the i -ve -, 11, does not even have a melting point? GT at 2J0 ° C / 3.8 (according to DIN r)?:) * -,) at most ¿j / 10 '. It has dominated, that this is not enough in all cases to overcome! f-1 trial mentioned above. Also, > > 1 document IIP-Bl -304b 7 ° describes a possibility to improve the stability against water cl Lenturia thus the stability against the cracking by tensions _-n pl.it composed of G? BS and PMMA , is disposed on a layer of a PMMA backing which is provided with an additional cover layer consisting of 30 to 70 weight percent PVDf- (poly (vimlidene fluoride)) and the remainder PMMA. With these plates, the requirements, as indicated in the EN 263 standard, could already be met, to acrylic plates made by casting for bathtubs and shower panels for domestic use. However, the stability against stress cracking against alcohols, especially against methanol, as well as the examination according to point 9 of the EN 263 standard with an additional cleaning process has not yet been considered sufficient. It is the object of the invention to create a composite plate of the kind mentioned at the beginning which is distinguished by * a statute Ldad versus improved hot-cold water, as well as for a stability against cracking by stresses against chemical products contained in cleaning agents, in particular alcohol. In accordance with the invention, this is co-operated because of the fact that the glass is acryl. t I read from a mixture of PMMA with tenacity * 1 modified impact and PMMA «'and r. For PMMA ostandaí «• • ntiondon ho o - poly (methyl metacp lates). By PHMA '* on ten ci the modified impact is understood, first of all, (polymer (alloys) of rnotacpla + o methyl methyl with less d, 0% i Z in mass), pre eri lemen e less than 10% de o os acp Latos (in particpacula acp Butyl scale, ethyl acetate or inert iron.) By the Applicant's research it can be deduced that) particular against alcohols, in the case of PMMA; and the smaller the modulus of elasticity (module E) and the smaller * the MF is! (fusion index). As a general rule, this problem can be solved very well by high molecular weight PMMi types with nodifiedated impact toughness (low melting rates, generally below 2.0 g / 10 'at 230 ° C / 3.8 depending on the DIN 53753 standard). However, the drawback of these PMMA types with modified impact toughness is that they have a lower scratch resistance compared to PMMA with unmodified impact toughness and, in the case of prolonged storage in hot water, form a turbidity in the PMMA layer. For * reason, it was not possible to employ * until now types of PMMA with tenacity to the modified impact and of high molecular weight in plates of coextrusion of ABS '. n PUMA for the subs? gu? n + o labpcacion of upl or enti -, of bathing s ^ shower '* ,. I? - The basic idea of J invention is to logically, by means of a pre-established mixture of PMMA from the molecular weight (under MF I) with PMMM with tenacity to the modified nopa- or cover layer -_ n composite plates with a PMMA coating, a m-pr essential for stability against lime water, a chemical stability for stress cracking is .1 time of a scratch resistance not diminished .. While a mixture of PMMA with impact toughness modified with standard PMMA * can improve * basically the desired properties, the mixing tests carried out by the applicant have shown that only one puna relatively small of the possible mixtures meets the highest requirements (in particular the standard FN 263 with an additional cleaning by aggressive cleaning agents v usual in trade) in relation to the stability against cold and hot water and the Chemical stability against stress cracking. This low range is best described by the melting index and / or modulus E of PMMA-based mixtures with impact toughness modified with standard PMMA, namely * an MFI less than 0.8 and an E module between 2500 and 2800 MPa .. In virtue of the results available, -, they reach the stability against the hot-cold water and the ostalulidad against you cracking by tensions (in particular against alcohols) higher by mixtures of PMMA with tenacity to the impact modified with standard PMMA that present a MFT to 230"rv3..8 according to DIN 53753 of at most 0.8 and, at the same time, an E module (according to ISO 527) of 2500 to 2800 l ' IPa A composite plate according to the invention can consist, for example, of a support plate L of several mi 1 niiwrt r orr of * -? Poso? Consisting evont uaimente on ABS mixed with PMMA. a layer of ABS of a thickness of approximately 10-20% (referred to as total weight *) which forms the basis of color for a coating 3 of acrylic glass (PMMA) with a thickness of 1-30% (referred to the total * thickness). The composite plate can be manufactured, for example, by co-extruding the layers in a wide-slot nozzle.

Claims (3)

NOVELTY OF THE INVENTION CLAIMS

1. - Composite plate, from which, by deep drawing, a supplement for sanitary articles (bathtubs, shower panels, sinks, sinks) can be manufactured, being arranged on a base, in particular * of < ? cp loni tp lobutadiene-styrene (ABS) a coating (3) of poly (methyl methacrylate) (PMMA, acrylic glass), car-acted because the acrylic glass coating consists of a mixture of PMMA with tenacity to modified impact and standard PMMA.

2. Composite plate according to claim 1, characterized in that the MFT of the mixture at 230 OD / 3.8 according to DIN 53753 is below 0.8 g / 10 '.

3. Composite plate according to claims i and 2, characterized in that the module E of the mixture used in the coating (3) amounts to 2500 to 2800 MPa. .- Composite plate according to one of the reivifications 1 to 3, characterized in that the PMMA with modified impact toughness is a methyl methacrylate copolymer and less than 30% (mass%), preferably less than 10% acrylic. 5. Composite plate according to claim 4, characterized in that acyl butyl acrylate, ethyl acrylate or methyl acrylate are used as acplate.