초록 ▼

The present invention provides a polyacetal resin composition having excellent mechanical characteristics with reduced generation of formaldehyde. To 100 parts by weight of (A1) a polyacetal resin having substantially straight chain molecular structure, there are added 0.1-20 parts by weight of (A2)

The present invention provides a polyacetal resin composition having excellent mechanical characteristics with reduced generation of formaldehyde. To 100 parts by weight of (A1) a polyacetal resin having substantially straight chain molecular structure, there are added 0.1-20 parts by weight of (A2) a polyacetal resin having a branched or cross-linked molecular structure, 3-200 parts by weight of (B) a glass-base inorganic filler, and 0.001 to 3 parts by weight of (C) a boric acid compound.

대표청구항 ▼

The invention claimed is: 1. A polyacetal resin composition comprising: 100 parts by weight of (A1) a polyacetal resin having a substantially straight chain molecular structure; 0.1-20 parts by weight of (A2) a polyacetal resin having a branched or cross-linked molecular structure, wherein the (A2)

The invention claimed is: 1. A polyacetal resin composition comprising: 100 parts by weight of (A1) a polyacetal resin having a substantially straight chain molecular structure; 0.1-20 parts by weight of (A2) a polyacetal resin having a branched or cross-linked molecular structure, wherein the (A2) polyacetal resin is a cross-linked polyacetal copolymer prepared by copolymerizing 99.89 to 88.0% by weight of (a) trioxane, 0.1 to 10.0% by weight of (b) a compound selected from a cyclic ether compound having no substituent and a cyclic formal compound having no substituent, and 0.01 to 2.0% by weight of (c) a polyfunctional glycidyl ether compound, and having a melt index in a range from 0.1 to 10 g/min (determined at 190° C. and 2.16 kg of load); 3-200 parts by weight of (B) a glass-base inorganic filler; and 0.001 to 3 parts by weight of (C) a boric acid compound. 2. The polyacetal resin composition according to claim 1, wherein the (B) glass-base inorganic filler is glass fiber. 3. The polyacetal resin composition according to claim 1, wherein the (B) glass-base inorganic filler is selected from glass beads, milled glass fiber and glass flake. 4. The polyacetal resin composition according to claim 1, wherein the (B) glass-base inorganic filler is one treated by aminoalkoxysilane on the surface thereof. 5. The polyacetal resin composition according to claim 1, wherein the (A1) polyacetal resin is a polyacetal copolymer prepared by copolymerizing 99.9 to 90.0% by weight of (a) trioxane with 0.1 to 10.0% by weight of (b) a compound selected from a cyclic ether compound having no substituent and a cyclic formal compound having no substituent, and having a melt index in a range from 1 to 50 g/min (determined at 190° and 2.16 kg of load). 6. The polyacetal resin composition according to claim 1, wherein the (c) polyfunctional glycidyl ether compound is one having three or four glycidyl groups. 7. The polyacetal resin composition according to claim 1, wherein the (c) polyfunctional glycidyl ether compound is selected from trimethylol propane triglycidyl ether, glycerol triglycidyl ether and pentaerythritol tetraglycidyl ether. 8. The polyacetal resin composition according to claim 5, wherein the (b) compound is one or two or more selected from ethylene oxide, 1,3-dioxolane, 1,4-butanediol formal and diethylene glycol formal. 9. The polyacetal resin composition according to claim 1, wherein the (c) boric acid compound is at least one selected from orthoboric acid, metaboric acid, tetraboric acid and diboron trioxide. 10. The polyacetal resin composition according to claim 1, further comprising 0.001 to 3 parts by weight of (D) a triazine derivative having a functional group containing nitrogen to 100 parts by weight of the (A1).