Stock material or miscellaneous articles – Composite – Of polycarbonate
Patent
1993-10-04
1996-05-21
Nakarani, D. S.
Stock material or miscellaneous articles
Composite
Of polycarbonate
428413, 4284231, 4284242, 4284244, 428447, 428451, 428480, 428483, 428515, 428520, 5253273, B32B 2736
Patent
active
055188184
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a coating used for improving the surface properties such as surface hardness, scuff resistance, wear resistance and surface gloss, of a variety of substrates, a primer for improving weathering-resistant adhesion to substrates, and a multilayer coated article.
BACKGROUND ART
Various coatings have been proposed to improve the surface properties, such as scuff resistance, wear resistance, surface hardness and surface gloss, of various substrates. Many primers have also heretofore been proposed to improve the adhesion between the coatings and the substrates.
Furthermore, for the purpose of preventing the substrates, the primer coatings or surface coatings from being subjected to deterioration and yellowing or peeling, caused by UV-rays in sunlight, during outdoor use, there have been made many attempts to add UV absorbers to the substrates, the surface coatings or the primer coatings.
For example, there have been the following disclosures: attempts to add UV absorbers to the substrates have been disclosed by Kokai (Japanese Unexamined Patent Publication) Nos. 62-146951 and 1-247431; attempts to add UV absorbers to the primer coatings have been disclosed by Kokai (Japanese Unexamined Patent Publication) Nos. 2-16129, 2-16048 and 61-86259; and attempts to add UV absorbers to the surface coatings have been disclosed by Kokai (Japanese Unexamined Patent Publication) Nos. 1-96266, 1-55307 and 63-83117.
DISCLOSURE OF INVENTION
However, in the prior art techniques as described above, the added UV absorbers bleed when exposed outdoors for a long period of time, and as a result the coatings peel off, or the substrates and primer coatings exhibit yellowing (discoloration). Accordingly, the addition of UV absorbers cannot be considered as fundamentaly improving the weathering resistance of the substrates.
The present invention is intended to solve the problems as described above, and has the following construction: absorber having an unsaturated double bond; and which comprises a polymer comprising copolymerized units of an UV absorber having an unsaturated double bond on the substrate, and a hard coating on the primer coating.
BEST MODE FOR CARRYING OUT THE INVENTION
Examples of the UV absorber having an unsaturated double bond in the present invention are UV absorbers of benzotriazole type, benzophenone type, benzophenolate type, etc. There is no specific limitation on the fundamental structure of the UV absorbers, and UV absorbers having an unsaturated double bond are employed.
For example, examples of the benzophenone UV absorber having an unsaturated double bond include compounds having the following structure: ##STR1## wherein at least one of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 is an organic group having an unsaturated double bond (>C.dbd.C<), and the others are each independently a substituent group such as an alkyl group, an alkenyl group, an aralkyl group, an aryl group, an alkoxy group, an aralkoxy group, an allyloxy group, a hydroxy group, a halogeno group, a sulfonic acid group, an ester of a sulfonic acid group, a carboxylic acid group, an ester of a carboxylic acid group, acid group and an ester of a phosphoric acid group and are not specifically restricted.
Furthermore, examples of the benzotriazole UV absorber having an unsaturated double bond include compounds having the following structure: ##STR2## wherein at least one of R.sup.5, R.sup.6 and R.sup.7 is an organic group having an unsaturated double bond, and the others are each independently a substituent group such as an alkyl group, an alkenyl group, an aralkyl group, an aryl group, an alkoxy group, an aralkoxy group, an allyloxy group, a hydroxy group, a halogeno group, a sulfonic acid group, an ester of a sulfonic acid group, a carboxylic acid group, an ester of a carboxylic acid group, a phosphoric acid group and an ester of a phosphoric acid group and are not specifically restricted.
Still furthermore, examples of the phenyl benzoate UV absorber having an unsaturated double bond i
REFERENCES:
patent: 4216267 (1980-08-01), Lorenz et al.
patent: 4708908 (1987-11-01), Tateoka et al.
patent: 4847120 (1989-07-01), Gent
patent: 4880859 (1989-11-01), Stongo et al.
patent: 4927891 (1990-05-01), Kamath et al.
Kunio Goto "The Practical Handbook of Plastics and Additives for Rubber," Oct. 1, 1972 (1, Oct. 1972), Kagaku Kogyosha, 1. 1-4, p. 307 6th to 5th lines from the bottom, p. 307.
Fujimoto Hiroko
Kidai Masayuki
Taniguchi Takashi
Miller Austin R.
Nakarani D. S.
Toray Industries Inc.
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