EP0000440A1 - Gegenstände deren Oberfläche zum Teil aus Polymethylmethacrylatharz besteht und Verfahren zu deren Herstellung - Google Patents

Gegenstände deren Oberfläche zum Teil aus Polymethylmethacrylatharz besteht und Verfahren zu deren Herstellung Download PDF

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Publication number
EP0000440A1
EP0000440A1 EP78300128A EP78300128A EP0000440A1 EP 0000440 A1 EP0000440 A1 EP 0000440A1 EP 78300128 A EP78300128 A EP 78300128A EP 78300128 A EP78300128 A EP 78300128A EP 0000440 A1 EP0000440 A1 EP 0000440A1
Authority
EP
European Patent Office
Prior art keywords
surface region
thermoplastics
conforming
polymethyl methacrylate
cloth
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP78300128A
Other languages
English (en)
French (fr)
Inventor
Michael Ian Birrell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Publication of EP0000440A1 publication Critical patent/EP0000440A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/22—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using layers or sheathings having a shape adapted to the shape of the article

Definitions

  • This invention relates to an article (especially a piece of furniture or sanitary ware) having a polymethyl methacrylate surface region reinforced by another member.
  • 'Perspex' baths have comprised a polymethyl methacrylate surface region reinforced by spraying curable polyester resin onto the back of the surface region and curing the resin to form a rigid backing which adheres to and reinforces the surface region.
  • Such backings must be sprayed and cured in situ on the bath and cannot be pre-formed economically.
  • thermoplastics member having a surface shaped to conform to the shape of polymethyl methacrylate surface region.
  • the surface region may be flat or it may be contoured and in register with a correspondingly shaped surface on the thermoplastics member.
  • articles having flat surface regions include table tops and panels for cabinets or the fronts of drawers and examples of articles having contoured surface regions include baths, washbasins (especially vanity units) and chair shells and some or all of these articles may be designed to form a matching bathroom suite.
  • the thermoplastics member can be preformed by mass production techniques such as melt-shaping and more particularly injection moulding, vacuum forming or rotational moulding. Additionally, thermoplastics members can easily be made with other features such as accommodation for cupboards and drawers.
  • An article according to the invention may be made by a method in which the polymethyl methacrylate surface region is applied to the thermoplastics member which has been pre-formed by a melt-shaping process which provides the member with a surface shaped to conform to the shape of surface region of the finished article.
  • the polymethyl methacrylate surface region may be assembled on the conforming surface of the pre-formed thermoplastics member and held in place by bolts, rivets or clamps preferably positioned around the perimeter of the surface region or by adhesives.
  • Contoured surfaces may be sufficiently intimately in register as to avoid the need for additional holding means especially if the surface region and thermoplastics member are resilient and the contour is shaped to define a snap-action fit between them.
  • the polymethyl methacrylate surface region may be applied to the conforming surface of the thermoplastics support by using the conforming surface as one part of a mould which defines the surface region, filling the mould with a syrup of methyl methacrylate monomer and polymerising the monomer in contact with the conforming surface so as to produce a polymethyl methacrylate surface region which is in intimate contact with the conforming surface.
  • thermoplastics reinforcing member A further advantage of the use of a pre-formed thermoplastics reinforcing member is that they readily permit decorative interlayers to be sandwiched between the pre-formed member and a transparent or translucent polymethyl methacrylate surface region through which the decorative interlayer is visible.
  • interlayers include optionally printed metal foil, thermoplastics film, paper or cloth.
  • Many interlayers can be made integral with the thermoplastics member by melt-shaping the member against the interlayer.
  • the surface region may be made integral with many interlayers by polymerising methyl methacrylate in contact with the interlayer which may optionally already be integral with the thermoplastics member.
  • a preferred cloth interlayer comprises a so-called melded cloth, that is to say a cloth composed of contiguous thermoplastics fibres welded together at various points throughout the cloth.
  • the cloth comprises conjugate fibres formed from at least two chemically different thermoplastics.
  • Preferred conjugate fibres comprise two chemically different nylons or polyethylene and polypropylene.
  • Melded cloths have the advantage that many thermoplastics can be injection moulded onto them without penetrating through the cloth and destroying its textile appearance.
  • the thermoplastics members are preferably made from crystalline polyolefins such as low or high density polyethylenes or preferably homopolymers of propylene or the so-called sequential copolymers of propylene made by injecting from 2 to 15% by weight of ethylene into the latter stages of an otherwise propylene homopolymerisation process.
  • the polyolefins preferably have melt flow indices of from 0.5 to 25 g/10 minutes (especially 1 to 4 g/10 minutes) as measured according to British Standard 2782:Part 1/105C/1976 using a 2.16 Kg load and performed at 230°C for propylene polymers and at 190°C for polyethylenes.
  • thermoplastics members may be solid or they may comprise a structural foam, that is to say a skin of thermoplastics material enclosing a foamed core of for example foamed polyolefin or foamed polyurethane.
  • the polymethyl methacrylate used in the performance of this invention may be a homopolymer of methyl methacrylate or a copolymer with up to 10% by weight of copolymerisable monomers such as alkyl acrylates (especially ethyl acrylate) or styrene.
  • Figure 1 shows a bath 1 consisting of a vacuum-formed contoured transparent polymethyl methacrylate surface region 2 in register with a correspondingly contoured surface 3 of a polypropylene reinforcing member 4 which reinforces surface region 2.
  • Surface region 2 is held in place by rivets 5.
  • Figure 2 shows a modification to bath 1 effected by sandwiching a decorative sheet 6 of melded cloth between transparent surface region 2 and surface 3. Sheet 6 is visible through surface region 2.
  • Figure 3 shows a further modification to bath 1 in which sheet 6a of melded cloth is integral with surface 3a of member 4a.
  • Figure 4 shows a third modification to bath 1 in which sheet 6b of melded cloth is integral with surface region 2a.
  • Figure 5 shows an end portion for a bath 1 modified as in Figure 2, the end portion consisting of a sheet 26 of melded cloth sandwiched between surface region 22 and surface 23.
  • Surface region 22 has a down-turned end 28 into which a groove 29 has been cut.
  • End 27 of member 24 is chamfered and makes a close fit in groove 29.
  • Down-turned end 28 and member 24 are resilient so that on placing surface region 22 over member 24, groove 28 and chamfered end 27 engage with a snap action and hold surface region 22 in place on member 24.
  • Figure 6 shows a chair shell 31 consisting of a contoured transparent polymethyl methacrylate surface region 32 in register with a correspondingly contoured surface 33 of a polypropylene reinforcing member 34 which reinforces surface region 32 and a sheet 36 of melded cloth integral with surface 33 and sandwiched between surface 33 and surface region 32.
  • the edges 35 of member 34 are turned over and embrace the edges of surface region 32 and sheet 36 holding them in place and forming a trim 38 (as shown in Figure 7) around surface region 32. Edges 35 are resilient so that on assembling surface region 32 on member 34, edges engage surface region 32 with a snap fit.
  • Figure 8 shows a check pattern 40 provided on sheet 36 and visible through transparent surface region 32.
  • the surface region may be made from an alternative organic thermoplastics material, preferably a transparent material instead of polymethyl methacrylate.
  • transparent materials include transparent polystyrene, polyvinyl chloride, polycarbonates and cellulosic materials such as cellulose acetates and butyrates.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Laminated Bodies (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
EP78300128A 1977-07-15 1978-07-07 Gegenstände deren Oberfläche zum Teil aus Polymethylmethacrylatharz besteht und Verfahren zu deren Herstellung Withdrawn EP0000440A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2980277 1977-07-15
GB2980277 1977-07-15

Publications (1)

Publication Number Publication Date
EP0000440A1 true EP0000440A1 (de) 1979-01-24

Family

ID=10297401

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78300128A Withdrawn EP0000440A1 (de) 1977-07-15 1978-07-07 Gegenstände deren Oberfläche zum Teil aus Polymethylmethacrylatharz besteht und Verfahren zu deren Herstellung

Country Status (2)

Country Link
EP (1) EP0000440A1 (de)
JP (2) JPS5448871A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2241191A (en) * 1990-02-22 1991-08-28 David Kane Forming decorative panels
US5400552A (en) * 1991-10-16 1995-03-28 Spit Ecopic Line Preventive device against nuisance from birds
EP0736372A1 (de) * 1995-04-07 1996-10-09 Röhm Gmbh Polymeres Verbundsystem

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB482836A (en) * 1935-10-05 1938-04-05 Roehm & Haas Ag Improvements in or relating to the manufacture of plates, sheets or other shaped or moulded articles
GB904763A (en) * 1959-05-25 1962-08-29 Moeller Hans Guenter Improvements in or relating to bathtubs and like containers made from synthetic resin materials
GB1332438A (en) * 1970-11-26 1973-10-03 Stanley Plastics Ltd Method of casting plastics articles
GB1337182A (en) * 1971-02-23 1973-11-14 Cranston A A Article finishes

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5829806B2 (ja) * 1974-02-13 1983-06-24 三菱レイヨン株式会社 タイマモウセイオ ユウスル ゴウセイジユシセイケイヒン
JPS5211071B2 (de) * 1973-10-22 1977-03-28
JPS5445426Y2 (de) * 1975-04-15 1979-12-26
JPS5211071U (de) * 1975-07-11 1977-01-26

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB482836A (en) * 1935-10-05 1938-04-05 Roehm & Haas Ag Improvements in or relating to the manufacture of plates, sheets or other shaped or moulded articles
GB904763A (en) * 1959-05-25 1962-08-29 Moeller Hans Guenter Improvements in or relating to bathtubs and like containers made from synthetic resin materials
GB1332438A (en) * 1970-11-26 1973-10-03 Stanley Plastics Ltd Method of casting plastics articles
GB1337182A (en) * 1971-02-23 1973-11-14 Cranston A A Article finishes

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2241191A (en) * 1990-02-22 1991-08-28 David Kane Forming decorative panels
GB2241191B (en) * 1990-02-22 1993-08-25 David Kane Forming decorative panels
US5400552A (en) * 1991-10-16 1995-03-28 Spit Ecopic Line Preventive device against nuisance from birds
EP0736372A1 (de) * 1995-04-07 1996-10-09 Röhm Gmbh Polymeres Verbundsystem

Also Published As

Publication number Publication date
JPH0420606Y2 (de) 1992-05-12
JPS5448871A (en) 1979-04-17
JPH02104230U (de) 1990-08-20

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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STAA Information on the status of an ep patent application or granted ep patent

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Effective date: 19810416

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BIRRELL, MICHAEL IAN