Method to improve thread drawing when manufacturing a vehicle lamp by using a hot plate melt-bonding method
AssigneeKaneka Corporation
InventorsKenji Nishimoto, Yoshihiko Hashimoto
Life of this patent
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Abstract
In manufacturing a vehicle lamp by a hot plate melt-bonding method whereby a lamp body comprising thermoplastic resin is melted by pressing onto it a heated hot plate, then joining the lamp body and a lamp lens by press-fixing the melted part onto the lamp lens, improvement is effected in respect of thread drawing of the resin constituting the lamp body by employing a lamp body that is molded of a resin composition (C) as chief constituent whereof a total of 100 weight parts consist of 80˜5 weight parts of a specified graft copolymer (A) obtained by graft polymerization of an α,β-unsaturated acid glycidyl ester compound and 20˜95 weight parts of vinyl copolymer (B).
Claims9
A method of decreasing thread drawing of a thermoplastic resin in the manufacture of a vehicle lamp comprising the steps of partially melting a lamp body composed of said thermoplastic resin by pressing onto it a heated hot plate, then removing the heated hot plate from the lamp body, then joining the lamp body and a lamp lens by press-fixing the melted part of the lamp body onto a methyl methacrylate resin lamp lens,
- wherein a resin composition (C) in an amount of 100 weight parts and consisting of 80˜5 weight parts of the graft copolymer (A) specified below and 20˜95 weight parts of the vinyl copolymer (B) specified below is used as the thermoplastic resin:
- (A) a graft copolymer obtained by graft polymerization of 80˜5 weight parts of a mixture of monomers with 20˜95 weight parts of rubber-like polymer having an average particle size of 0.05˜1 μm;
- said monomer mixture comprising 99.9˜60 weight % of one or two or more vinyl compounds selected from vinyl cyanide compounds, aromatic vinyl compounds and alkyl (meth)acrylate compounds, 0˜30% of another copolymerizable vinyl compound, and 0.1˜40 weight parts of an α,β-unsaturated acid glycidyl ester compound;
- (B) a vinyl copolymer obtained by reacting 10˜40 weight % of a vinyl cyanide compound with 60˜90 weight % of an aromatic vinyl compound and 0˜30 weight % of another copolymerizable vinyl compound;
- wherein melting of the lamp body is effected by maintaining the hot plate pressed onto the lamp body at a temperature of 300˜500° C.
Dependencies are inferred from the claim text.