Methacrylic resin composition for hot plate fusion, use of methacrylic resin composition for hot plate fusion, fusion method, and vehicle component.

Abstract

Provided is a methacrylic resin composition for hot-plate welding which, when separated from the hot plate in hot-plate welding, is less apt to string and which, when demolded in injection molding, is less apt to leave a residue on the mold surface, that is, which is suitable for injection molding and hot-plate welding. This methacrylic resin composition for hot-plate welding comprises a methacrylic polymer and a fatty acid.

Claims

1. It contains a methacrylic polymer and a fatty acid, A methacrylic resin composition for hot plate fusion, wherein the fatty acid has 10 to 22 carbon atoms.

2. The methacrylic resin composition for hot plate fusion according to Claim 1, wherein the 10% weight loss temperature of the fatty acid, as measured by the following method, is 250°C or less. (Measurement of 10% weight loss temperature) The temperature at which fatty acids lose 10% of their weight is determined using a thermogravimetric analyzer. When the temperature is raised from 40°C to 500°C at a heating rate of 10°C / min while flowing dry nitrogen at a rate of 100 ml / min, the weight loss rate is 10%.

3. The methacrylic resin composition for hot plate fusion according to claim 1 or 2, wherein the melting point of the fatty acid is 50°C or higher.

4. The methacrylic resin composition for hot plate fusion according to any one of claims 1 to 3, wherein the fatty acid is a chain-like hydrocarbon compound having at least one carboxyl group in its molecule.

5. The methacrylic resin composition for hot plate fusion according to any one of claims 1 to 4, wherein the molecular weight of the fatty acid is 100 to 500.

6. The methacrylic resin composition for hot plate fusion according to any one of claims 1 to 5, wherein the content of the fatty acid is 0.01 to 1 part by mass per 100 parts by mass of the methacrylic polymer.

7. The methacrylic resin composition for hot plate fusion according to any one of claims 1 to 5, wherein the content of the fatty acid is 0.01 to 1% by mass with respect to the total mass (100% by mass) of the methacrylic resin composition for hot plate fusion.

8. The methacrylic resin composition for hot plate fusion according to any one of claims 1 to 7, wherein the fatty acid comprises at least one selected from stearic acid, palmitic acid, and myristic acid.

9. The methacrylic resin composition for hot plate fusion according to any one of claims 1 to 8, wherein the methacrylic polymer contains repeating units derived from methyl methacrylate, and the content ratio of the repeating units derived from methyl methacrylate in the methacrylic polymer is 70% by mass or more.

10. The methacrylic polymer is polymer (A) which includes repeating units derived from (meth)acrylic acid ester monomers and structural units derived from ring structures. The methacrylic resin composition for hot plate fusion according to any one of claims 1 to 9, wherein the ring structure-derived structural unit comprises at least one selected from glutaric acid anhydride structural unit, maleic acid anhydride structural unit, glutarimide structural unit, lactone ring structural unit, and N-substituted maleimide structural unit.

11. The methacrylic resin composition for hot plate fusion according to claim 10, wherein the polymer (A) comprises repeating units derived from methyl methacrylate (A1), repeating units derived from (meth)acrylic acid (A2), and glutaric acid anhydride structural units (A3).

12. A methacrylic resin composition for hot plate fusion according to any one of claims 1 to 11, to be used as a raw material for vehicle components.

13. The methacrylic resin composition for heat plate fusion according to claim 12, wherein the vehicle component is at least one selected from a taillight cover, a headlight cover, and an instrument panel.

14. Use of the methacrylic resin composition for hot plate fusion according to any one of claims 1 to 13 for hot plate fusion.

15. A step of bringing at least a portion of a first member formed from a methacrylic resin composition for heat plate fusion according to any one of claims 1 to 13 into contact with a heat plate and melting it, A method for fusing a first member and a second member, comprising the steps of: pulling the first member away from the heating plate and pressing it together with the second member.

16. A vehicle component including a composite member formed by heat-bonding a first member and a second member, The first member comprises a methacrylic polymer and a fatty acid, A vehicle component wherein the fatty acid has 10 to 22 carbon atoms.

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