Stock material or miscellaneous articles – Composite – Of polycarbonate
Reexamination Certificate
1997-12-09
2001-05-08
Thibodeau, Paul (Department: 1773)
Stock material or miscellaneous articles
Composite
Of polycarbonate
C428S522000, C427S508000, C427S515000, C002S435000, C522S077000, C522S083000, C522S085000, C522S099000, C522S182000, C264S175000, C264S210100
Reexamination Certificate
active
06228499
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a resin molded article having a scuff resistant organic hard coat layer and an antifogging organic hard coat layer.
BACKGROUND TECHNOLOGY
Because they exhibit excellent impact resistance and clarity, resins such as polycarbonate resin, acrylic resin, clear polyolefin resin, polystyrene resin, and the like, are used in highway noise—shield boards, automotive head light lenses, helmet shields, goggles, instrument cover materials, and the like.
However, resin molded articles including polycarbonate resins, which are hydrophobic, are deficient in that when such molded articles are used in a high humidity environment, dew forms on the surface of such molded articles, thereby adversely affecting its clarity.
In addition, resin molded articles are deficient in that because they lack a high surface hardness, such as that of a glass product, the surfaces of said molded articles tend to have scratches, thereby adversely affecting the clarity of the molded article.
Japanese Patent Laid-open Publication No. Sho57-69043,Hei2-16185, etc., have disclosed resin molded articles with an anti-dew formation capability by generating on the surface of a resin molded article a hydrophilic polymer coat layer, but there are disadvantages in that the adhesion between the hydrophilic polymer layer and the surface of the resin molded article is not sufficient and the durability of the anti-dew formation effect is deficient.
Japanese Patent Laid-open Publication No. Hei6-13615 discloses an invention which provides a plastic molded article having an antifogging organic hard coat layer by applying a coating agent, which is obtained by adding 0.05-2% by weight of nonionic or anionic surfactant with a HLB value at 6-11 to a polyalkylene glycol di(meth)acrylate, onto the surface of a plastic molded article and then photoirradiating the coated surface, thereby hardening it. The plastic molded article provided with the antifogging organic coat layer obtained by this method exhibits a significantly better antifogging property compared to the prior art products, but the durability of the antifogging effect when in under a high humidity environment is not yet satisfactory, and in addition, the plastic molded article has an insufficient scuff resistance, so that when such a product is used as an outdoor illumination cover, a highway noise shield wall, an automotive headlight lens, a motorcycle helmet shield, and a pair of goggles, scratches on the surface of such a molded article occur easily, thereby causing a decrease in the light transmittance.
Therefore, it may be possible to fabricate a resin molded article provided with certain degrees of antifogging properties and scuff resistance by means of the prior art, but such products in use are deficient in that the antifogging properties of said resin molded articles rapidly decrease with time to the loss of antifogging properties, and the scuff resistance is insufficient, whereby causing the product to have an increasing amount of scuffing over time.
DISCLOSURE OF THE INVENTION
The present inventors studied with the objective of forming a resin molded article free of the above deficiencies, that is, a resin molded article provided with a lasting scuff resistance and lasting antifogging properties at satisfactory levels and have completed the present invention.
There is provided in the present invention a resin molded article in which its cross sectional structure is novel in that one side of the substrate of the resin molded article is provided with a scuff resistant organic hard coat layer having a haze value of not more than 5%, and the other side of the substrate is provided with an antifogging organic hard coat layer of a specific composition, wherein the invention having a feature in that the adhesion between the substrate and the organic hard coat layer is particularly outstanding whereby no peeling between the substrate and the organic hard coat layer occurs when the article is bent at a radius of curvature of not more than 50 mm.
Incidentally, the haze value (%) in this invention is a numerical value calculated by the method defined in the section on test items for the resin molded articles in the examples given herein below.
REFERENCES:
patent: 5214085 (1993-05-01), Patel et al.
patent: 5426131 (1995-06-01), Katsamberis
patent: 5663264 (1997-09-01), Kawau et al.
English Abstract of JPO 06073213, Mar. 1994.*
English Abstract of JPO 3-141944 A, Sep. 1991.*
English Abstract of JPO 2-129235 A, May 1990.
Kawai Osamu
Nakauchi Jun
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Mitsubishi Rayon Co. Ltd.
Tarazano D. Lawrence
Thibodeau Paul
LandOfFree
Molded resin articles having marproof organic hard coat... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Molded resin articles having marproof organic hard coat..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Molded resin articles having marproof organic hard coat... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2565869