Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1997-12-23
1999-11-30
Ball, Michael W.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156230, 156245, 1562737, 1562755, 1562757, 428 415, 428 417, 428 418, 4284242, 428515, 427146, 264259, 522 90, 522100, 522120, B32B 706, B32B 712, B32B 3128, B32B 2308
Patent
active
059935880
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a heat and active energy ray curable resin composition used for the protecting layer of a transfer material, which can provide at a low cost a molded article excellent in abrasion resistance and chemical resistance, and which does not cause crack in the curved part of the molded article, a transfer material, a surface protecting material, and a process for producing a molded article excellent in abrasion resistance and chemical resistance.
PRIOR ART
As a method for producing a molded article excellent in abrasion resistance and chemical resistance, there are a method in which the protecting layer of a transfer material produced by forming a protecting layer on a substrate sheet having releasing property, is adhered on the surface of a molded article, and the substrate sheet is released, a method in which the substrate sheet of a surface protecting material produced by forming a protecting layer on a substrate sheet having no releasing property, is adhered on the surface of a molded article, and the like.
As a protecting layer used for a sheet material such as the above-described transfer material and surface protecting material, a heat curable resin and an active energy ray curable resin are generally used.
However, when a heat curable resin is used as a protecting layer, the surface of a molded article is inferior in chemical resistance and abrasion resistance in general.
On the other hand, when an active energy ray curable resin is used as a protecting layer, the crosslinking density of a resin which forms the protecting layer increases, and chemical resistance and abrasion resistance are improved. However, the resultant protecting layer becomes fragile. As a result, cracking occurs on the protecting layer at the part which curves along a molded article in adhering.
Therefore, there has been suggested a method in which, an active energy ray curable resin formed as a protecting layer, is irradiated with an active energy ray first for semi-curing the resin to form a sheet material. The protecting layer is applied on the surface of a molded article, and the active energy ray curable resin is again irradiated with an active energy ray for completely curing.
However, in this method, if the irradiation amount of the active energy ray is deficient in the first irradiation step, flowability and stickiness remain on the surface of the protecting layer of the sheet material. As a result, handling of the sheet material becomes inconvenient.
On the other hand, when the irradiation amount is excess, cracking is liable to occur in the protecting layer at the curved part of the molded article in adhering.
To prevent such a problem, it is necessary to control the irradiation amount in the first irradiation step. However, a radical polymerization proceeds quickly and a dark reaction progresses even after irradiation of an active energy ray, therefore, it is not easy to control the irradiation amount. There is also a problem that the irradiation condition is liable to be unstable due to degradation of the light source of the active energy ray.
Further, the sheet material has wide and large surface area, and a large scale and costly irradiation apparatus is required for irradiating it.
The object of the present invention is to provide a resin composition used for the protecting layer of a sheet material which solves the above-mentioned problems, which can give a molded article excellent in abrasion resistance and chemical resistance at a low cost, and which does not cause cracking at the curved part of the molded article in adhering the sheet material.
SUMMARY OF THE INVENTION
The present inventors have intensively studied to solve the above-mentioned problems. As a result, we have found that the above-mentioned problems can be solved, on condition that a heat and active energy ray curable composition comprising a specific polymer and polyfunctional isocyanate is used as an active ingredient, in producing the protecting layer of a sheet material, such as a transfer ma
REFERENCES:
patent: 4017649 (1977-04-01), DeMajistre
patent: 4369157 (1983-01-01), Conner
patent: 4598009 (1986-07-01), Christie et al.
patent: 4617349 (1986-10-01), Nasu et al.
patent: 4786657 (1988-11-01), Hammar et al.
patent: 5174848 (1992-12-01), Yazaki et al.
patent: 5674623 (1997-10-01), Haddon et al.
Ball Michael W.
Nissha Printing Co. Ltd.
Tolin Michael A
LandOfFree
Thermo and active energy ray curable resin composition used for does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Thermo and active energy ray curable resin composition used for , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermo and active energy ray curable resin composition used for will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1666822