Vehicle lamp and lens molded article

Patent metadata

Field	Value
Publication number	US-10315362-B2
Application number	US-201515531373-A
Country	US
Kind code	B2
Filing date	Oct 29, 2015
Priority date	Nov 27, 2014
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

Abstract

The present invention provides a vehicle lamp comprising a lens molded article ( 1 ) and a housing molded article ( 2 ) laser-welded to each other, the lens molded article ( 1 ) comprising a methacrylic resin composition which comprises 70 to 99.9% by mass of a methacrylic acid ester monomer unit and 0.1 to 30% by mass of a unit of an additional vinyl monomer copolymerizable with the methacrylic acid ester monomer and satisfies conditions (a) to (c), and the housing molded article ( 2 ) comprising a resin which satisfies a condition (d): (a) MW is 90000 to 250000; (b) a mass (MFR-1) of the methacrylic resin composition emitted according to ISO1133 standard at 230° C. and 3.8 kg for 10 minutes is 0.2 to 12 g/10 min; (c) when a mass of the methacrylic resin composition emitted according to the ISO1133 standard at 230° C. and 10 kg for 10 minutes is defined as MFR-2, MFR ratio=(MFR-2)/(MFR-1) is 4.5 or more; and (d) a mass (MFR-3) of the resin emitted according to the ISO1133 standard at 220° C. and 10 kg for 10 minutes is 2 to 45 g/10 min or smaller.

First claim

The invention claimed is:

1. A vehicle lamp comprising a lens molded article and a housing molded article laser-welded to each other,
the lens molded article comprising a methacrylic resin composition which comprises 70 to 99.9% by mass of a methacrylic acid ester monomer unit and 0.1 to 30% by mass of a unit of at least one additional vinyl monomer copolymerizable with the methacrylic acid ester monomer and satisfies following conditions (a) to (c), and
the housing molded article comprising a resin which satisfies following condition (d):

(a) a weight-average molecular weight measured by gel permeation chromatography (GPC) is 90000 to 250000;
(b) a value of a mass (MFR-1) of the methacrylic resin composition emitted according to ISO1133 standard under conditions involving a temperature of 230° C. and a load of 3.8 kg for 10 minutes is in a range of 0.2 g/10 min or larger and smaller than 12 g/10 min;
(c) when a mass of the methacrylic resin composition emitted according to the ISO1133 standard under conditions involving a temperature of 230° C. and a load of 10 kg for 10 minutes is defined as MFR-2,
an MFR ratio of following formula (1) is 4.5 or more:
MFR ratio=(MFR-2)/(MFR-1)  (1); and

(d) a mass (MFR-3) of the resin emitted according to the ISO1133 standard under conditions involving a temperature of 220° C. and a load of 10 kg for 10 minutes is 2 g/10 min or larger and 45 g/10 min or smaller.

2. The vehicle lamp according to claim 1 , wherein the housing molded article comprises at least one resin selected from the group consisting of an ASA resin, an ABS resin, an AES resin, a SAS resin, and an ACS resin.

3. The vehicle lamp according to claim 1 , wherein a difference in a Vicat softening temperature between the lens molded article and the housing molded article is 30° C. or less.

4. The vehicle lamp according to claim 1 , wherein a Vicat softening temperature of the lens molded article is 98° C. or higher.

5. The vehicle lamp according to claim 1 , wherein a Vicat softening temperature of the housing molded article is 96° C. or higher.

6. The vehicle lamp according to claim 1 , wherein a value of the MFR-1 is in a range of 0.2 g/10 min or larger and smaller than 10 g/10 min.

7. The vehicle lamp according to claim 1 , wherein the MFR ratio is 4.8 or more.

8. A lens molded article for laser welding comprising a methacrylic resin composition which comprises 70 to 99.9% by mass of a methacrylic acid ester monomer unit and 0.1 to 30% by mass of a unit of at least one additional vinyl monomer copolymerizable with the methacrylic acid ester monomer and satisfies following conditions (a) to (c):
(a) a weight-average molecular weight measured by gel permeation chromatography (GPC) is 90000 to 250000;
(b) a value of a mass (MFR-1) of the methacrylic resin composition emitted according to ISO1133 standard under conditions involving a temperature of 230° C. and a load of 3.8 kg for 10 minutes is in a range of 0.2 g/10 min or larger and smaller than 12 g/10 min; and
(c) when a mass of the methacrylic resin composition emitted according to the ISO1133 standard under conditions involving a temperature of 230° C. and a load of 10 kg for 10 minutes is defined as MFR-2,
an MFR ratio of following formula (1) is 4.5 or more:
MFR ratio=(MFR-2)/(MFR-1)  (1).

Assignees

• Asahi Chemical Ind

Inventors

• Kozawa Kazunori

Classifications

• F21S43/26

  Refractors, transparent cover plates, light guides or filters not provided in groups F21S43/235 - F21S43/255 · CPC title

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title

• B29C65/1477

  making use of an absorber or impact modifier (B29C65/1677 takes precedence) · CPC title

• F21V17/101

  permanently, e.g. welding, gluing or riveting · CPC title

• F21V5/04

  of lens shape · CPC title