Polyamide resin composition with good reflectance, impact strength, heat resistance, and water resistance and method of preparing the same
The present invention provides a polyamide resin composition comprising (A) about 100 parts by weight of polyamide resin; (B) about 0.1 to about 50 parts by weight of titanium dioxide; and (C) about 1 to about 20 parts by weight of modified polyolefin, wherein the (C) modified polyolefin is prepared by grafting a monomer that is partially miscible with the polyamide resin into the main chain of the polyolefin.
1. A polyamide resin composition comprising:
(A) about 100 parts by weight of polyamide resin;
(B) about 5 to about 50 parts by weight of titanium dioxide; and
(C) about 1 to about 15 parts by weight of modified polyolefin,
wherein the (C) modified polyolefin is prepared by grafting a monomer that is partially miscible with the polyamide resin into the main chain of the polyolefin, and wherein the (C) modified polyolefin comprises greater than 10% by weight to about 50% by weight of the monomer that is partially miscible with the polyamide resin.
2. The polyamide resin composition of claim 1 , wherein the (A) polyamide resin includes repeating units of dicarboxylic acid and aliphatic diamine, alicyclic diamine, or a combination thereof.
3. The polyamide resin composition of claim 1 , wherein the (A) polyamide resin is represented by Formula 1 below:
wherein n is an integer of 50 to 500.
4. The polyamide resin composition of claim 1 , wherein the main chain of the modified polyolefin includes about 70 to about 100% by weight of polyethylene, polypropylene, or ethylene-propylene copolymer.
5. The polyamide resin composition of claim 1 , wherein the monomer that is partially miscible with the polyamide resin comprises a (meth)acrylic acid C1-C10 alkyl ester, a modified ester, or a combination thereof.
6. The polyamide resin composition of claim 5 , wherein the monomer that is partially miscible with the polyamide resin comprises a (meth)acrylic acid C1-C10 alkyl ester.
7. The polyamide resin composition of claim 6 , wherein the monomer that is partially miscible with the polyamide resin comprises methyl acrylate, ethyl acrylate, butyl acrylate, or a combination thereof.
8. The polyamide resin composition of claim 5 , wherein the modified ester comprises an unsaturated ethylene group and a functional group.
9. The polyamide resin composition of claim 8 , wherein the functional group comprises epoxide, ethylene glycol, C6-C12 arylate, or CN.
10. The polyamide resin composition of claim 8 , wherein the modified ester comprises glycidyl (meth)acrylate, ethylene glycol modified (meth)acrylate, C6-C12 arylate modified (meth)acylate, acrylonitrile, or a combination thereof.
11. The polyamide resin composition of claim 1 , wherein the polyamide resin composition further comprises greater than 0 to about 60 parts by weight of (D) filler.
12. The polyamide resin composition of claim 11 , wherein the (D) filler is glass fiber.
13. The polyamide resin composition of claim 1 , wherein the polyamide resin composition exhibits an initial reflectance value at a wavelength of 440 nm of more than about 85 as measured according to CIE Lab color difference evaluation criteria using a Minolta 3600D spectrophotometer, and a decline of reflectance value of less than about 15 when measured again after maintaining the polyamide resin composition under conditions of 85° C. and relative humidity of 85% for 96 hours.
14. The polyamide resin composition of claim 1 , wherein the polyamide resin composition exhibits a change of initial yellow index (ΔYI) of less than about 10 as measured according to CIE Lab color difference evaluation criteria using a Minolta 3600D spectrophotometer after maintaining the polyamide resin composition under condition of 85° C. and relative humidity of 85% for 96 hours.
15. A method of producing a polyamide resin composition comprising mixing (A) about 100 parts by weight of polyamide resin; (B) about 5 to about 50 parts by weight of titanium dioxide; and (C) about 1 to about 20 parts by weight of modified polyolefin, wherein the modified polyolefin is prepared by grafting a monomer that is partially miscible with the polyamide resin into the main chain of the polyolefin, and wherein the (C) modified polyolefin comprises greater than 10% by weight to about 50% by weight of the monomer that is partially miscible with the polyamide resin.
16. The method of producing a polyamide resin composition of claim 15 , wherein the monomer that is partially miscible with the polyamide resin comprises a (meth)acrylic acid C1-C10 alkyl ester, a modified ester, or a combination thereof.
17. The method of producing a polyamide resin composition of claim 15 , wherein the polyamide resin composition further comprises greater than 0 to about 60 parts by weight of (D) filler.
18. An article prepared from the polyamide resin composition of claim 1 .
19. The article of claim 18 , wherein the article is a reflector for a LED.