Stock material or miscellaneous articles – Layer or component removable to expose adhesive – Polymer derived only from ethylenically unsaturated monomer
Patent
1995-03-27
1997-04-22
Ahmad, Nasser
Stock material or miscellaneous articles
Layer or component removable to expose adhesive
Polymer derived only from ethylenically unsaturated monomer
428 401, 428213, 428323, 428327, 428332, 428343, 428352, 428409, 525240, C08L 2304
Patent
active
056227604
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns plastic sheeting based on polymers of propylene and ethylene, which may also contain processing aids, fillers, pigments or other additives, and their use in the form of self-adhesive decorative sheets for coating any objects or molded articles.
Surface sheets for laminating of any objects appear in European Patent Application 0 343 491. These sheets are intended to be applied to the surfaces of objects, such as doors, shelves, or cabinets, of plastic, wood, wood derivatives, metals, or similar materials or substrates in colored, uncolored, or patterned form to provide protection against various undesirable effects such as corrosion, discoloration by light or mechanical action. Under some circumstances they are intended to be shaped to match the surface of the object in question. For instance, such a patterned sheet laminated onto a surface can give the impression of a valuable wood, even on an object that is not suitable for that because of its nature, structure, surface or color. The surface sheeting seen from European Patent Aplication 0 343 491 has a base sheet of a polymer of the methacrylate group. The polymer can be modified by addition of polyacrylates. A polymethyl methacrylate (PMMA) plasticized by polybutyl methacrylate (PBMA) is said to be particularly suitable. The known surface sheeting is said to have improved resistance to light and weathering. It has been found, in testing this sheeting, that it needs improvement. For instance, a plasticized PMMA exhibits relatively high white break or white crackling. Even if this material is modified for high impact, it still has only low impact resistance. It also has unsatisfactorily low wettability or surface tension values. High surface tension values are important for the printability of the basic sheet and for its sticking ability (adhesion between an adhesive layer and the basic sheet). For example, a basic sheet of PMMA has a surface tension of only 36 to 38 dyn/cm (measured according to DIN 53 364).
A sheet of the type indicated initially appears in German Laid-Open Patent 41 21 599. It has a base sheet that contains an ethylene-propylene copolymer, containing processing aids and/or additives and if desired, at least one dye-pigment mixture and/or filler. An adhesive layer is applied to the under surface or underside of the base sheet, along with, if necessary, a cover sheet or release sheet. If desired, the base sheet can have embossing and/or a color-printed layer. The ethylene-propylene polymer used in the 50 to 150 .mu.m thick base sheet has a melt flow index (230.degree. C., 2 kg) of more than 3 g/10 minutes and a tensile strength greater than 30 N/mm.sup.2. This sheet is used as a self-adhesive decorative sheet to coat glass, panels, paper, cardboard and other objects or molded articles of metal, wood, or wood derivatives. The known sheet is said to have a Shore hardness D of 55 to 70. Because of the specific starting materials, this known sheeting does not have satisfactory stiffness. The stiffness is important when such a sheet is used to laminate wood and other parts. High stiffness reduces the sensitivity of the laminated sheet to writing and scratches.
SUMMARY OF THE INVENTION
Starting with the state of the technology presented above, the invention was based on the objective of improving the sheeting mentioned initially so as to increase the surface tension of the upper sheet in particular, improve its impact resistance, and prevent white break as much as possible. If it is to be used as a laminating sheet, the laminated sheet should exhibit reduced sensitivity to writing and scratching.
This objective was gained according to the invention by 2.16 kg) of 0.8 to 3.0 g/10 minutes, a melting point, Tm, of about 154.degree. to 168.degree. C. (determined by DSC) and an E-modulus of about 900 to 1500 N/mm.sup.2 (determined according to DIN 53 457), and kg) of about 1.5 to 3.0 g/10 minutes, a melting point, Tm, of 110.degree. to 130.degree. C. and an E modulus of about 200 to 400 N/mm.sup
REFERENCES:
patent: 3372049 (1968-03-01), Schaffhausen
patent: 5439628 (1995-08-01), Huang
patent: 5486561 (1996-01-01), Hirano
Encyclopedia of Polymer Science and Engineering, 1986, vol. 6, pp. 410-444 and 446-447.
Polypropylene with Rheological Properties suitable for Calendering--Altendorfer, et al --Special reprint from Kunststoffe--German Plastics, (1990/6), pp. 1-4.
Article--Solvay Information--ELTEX P HL 402 and HV 403.
Kunststoff Taschenbuch--24th Edition, pp. 234-371.
Ahmad Nasser
Benecke-Kaliko AG
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