Active energy beam-curable resin composition, resin molding, and method for producing resin molding
Provided are: a resin composition with which it is possible to form a cured film having excellent weather resistance and wear resistance; and a resin molding having said cured film. An active energy beam-curable resin composition containing a radical polymerizable compound and a photopolymerization initiator (d), wherein said radical polymerizable compound contains 57-90 mass % of (a) caprolactone-modified mono- or poly-penta erythritol poly (meth)acrylate represented by formula (1) and 10-43 mass % of (b) urethane (meth)acrylate synthesized from a polycarbonate polyol having a branched alkyl structure and an average molecular weight falling within the range of 500-1000, a diisocyanate having an alicyclic structure, and a mono (meth)acrylate containing a hydroxyl group. In formula (1), each X independently represents a caprolactone-modified (meth)acryloyl group, a (meth)acryloyloxy group, or a —OH group.
1. An active energy beam-curable resin composition comprising radical polymerizable compounds and (d) a photopolymerizable initiator,
wherein the radical polymerizable compounds comprising, based on a total amount of 100% by mass of the radical polymerizable compounds,
71% to 90% by mass of (a) a caprolactone-modified mono- or poly-pentaerythritol poly(meth)acrylate represented by the following formula (1); and
10% to 29% by mass of (b) a urethane (meth)acrylate synthesized from a polycarbonate polyol having a branched alkyl structure and having a number average molecular weight in the range of 500 to 1,000, a diisocyanate having an alicyclic structure, and a mono(meth)acrylate containing a hydroxyl group:
wherein in formula (1), “4+2n” units of X each independently represent a (meth)acryloyloxy group modified by caprolactone (CH 2 ═CR—CO(O(CH 2 ) 5 C═O) y —O—), wherein R represents a hydrogen atom or a methyl group, and y represents an integer from 1 to 5; a (meth)acryloyloxy group (CH 2 ═CR—COO—),wherein R represents a hydrogen atom or a methyl group; or a —OH group; at least one X represents a (meth)acryloyloxy group modified by caprolactone, each of at least two X′s represents a (meth)acryloyloxy group, while each of the other X′s represents a —OH group; and n represents an integer from 0 to 4% by mass or less of (c) a radical polymerizable monomer other than (a) and (b), the radical polymerizable monomer (c) being crystallizable at a temperature of 25° C.
2. The active energy beam-curable resin composition according to claim 1 , wherein the active energy beam-curable resin composition further comprises (e) an ultraviolet absorber in an amount of 0.5 to 20 parts by mass relative to a total amount of 100 parts by mass of the radical polymerizable compounds.
3. The active energy beam-curable resin composition according to claim 1 , wherein the active energy beam-curable resin composition further comprises (e) an ultraviolet absorber in an amount of 0.5 to 20 parts by mass relative to a total amount of 100 parts by mass of the radical polymerizable compounds.
4. The active energy beam-curable resin composition according to claim 2 , wherein the (e) ultraviolet absorber has a molecular weight of 500 or more.
5. The active energy beam-curable resin composition according to claim 3 , wherein the (e) ultraviolet absorber has a molecular weight of 500 or more.
6. The active energy beam-curable resin composition according to claim 2 , wherein the (e) ultraviolet absorber is a combination of two or more kinds of ultraviolet absorbers each having a molecular weight of 500 or more.
7. The active energy beam-curable resin composition according to claim 3 , wherein the (e) ultraviolet absorber is a combination of two or more kinds of ultraviolet absorbers each having a molecular weight of 500 or more.
8. The active energy beam-curable resin composition according to claim 1 , wherein the active energy beam-curable resin composition further comprises (f) a hindered amine-based photostabilizer in an amount of 0.1 to 5 parts by mass relative to a total amount of 100 parts by mass of the radical polymerizable compounds.
9. A resin molded article having on a surface of the resin molded article, a cured film obtained by curing the active energy beam-curable resin composition according to claim 1 .
10. A resin molded article having on a surface of the resin molded article, a cured film obtained by curing the active energy beam-curable resin composition according to claim 8 .
11. The resin molded article according to claim 9 , wherein the resin molded article is a headlamp lens for automotive use.
12. The resin molded article according to claim 10 , wherein the resin molded article is a headlamp lens for automotive use.
13. A method for producing the resin molded article according to claim 9 , the method comprising applying the active energy beam-curable resin composition on the surface of the resin molded article, and irradiating the coating film thus obtained with an active energy beam.
14. A method for producing the resin molded article according to claim 11 , the method comprising applying the active energy beam-curable resin composition on the surface of a resin molded article, and irradiating a resultant coating film with an active energy beam.
15. A method for producing the resin molded article according to claim 10 , the method comprising applying the active energy beam-curable resin composition on the surface of a resin molded article, and irradiating a resultant coating film with an active energy beam.
16. A method for producing the resin molded article according to claim 12 , the method comprising applying the active energy beam-curable resin composition on the surface of a resin molded article, and irradiating a resultant coating film with an active energy beam.