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Resin composition for laser welding and molded article

A technology of resin composition and laser welding, which is applied in the field of polybutylene terephthalate resin composition, can solve problems such as inability to weld, time loss and environmental burden, and achieve high uniformity of welding and laser welding Excellent depositability and high welding strength

Active Publication Date: 2006-11-15
POLYPLASTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in these bonding methods, there are several problems
For example, if an adhesive is used, there are problems in the loss of process time until the adhesive is cured and the burden on the environment
Therefore, if such a molded product and the corresponding material (resin molded product) are laser welded, the molded product and the molded product as the corresponding material may not be welded uniformly and firmly at the contact interface.

Method used

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  • Resin composition for laser welding and molded article

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-10 and comparative example 1-2

[0098] In the examples and comparative examples, the following PBT resin (A), elastomer (B), polycarbonate resin (C), plasticizer (D), filler or reinforcing agent (E), Nucleating agent (F) and coloring agent.

[0099] PBT resin (A)

[0100] (A-1) Dimethyl isophthalate (DMI) modified PBT resin

[0101] In the reaction of terephthalic acid and 1,4-butanediol, 12.5 mol% of DMI was used as a copolymer component instead of a part of terephthalic acid (12.5 mol%) to prepare modified polybutylene terephthalate Diester.

[0102] Elastomer (B)

[0103] (B-1) Epoxy-containing polystyrene thermoplastic elastomer ESBS ["EPOFRIEND AT504" manufactured by Daicel Chemical Industry Co., Ltd.]

[0104] (B-2) Polyester thermoplastic elastomer ["GP200" manufactured by Toyobo Co., Ltd.]

[0105](B-3) Polystyrene-based thermoplastic elastomer [Kuraray Co., Ltd. product "Septon 4055"]

[0106] Polycarbonate resin (C)

[0107] (C-1) Polycarbonate resin ("PANLITE L-1225" manufactured by Teijin Chemical Co...

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Abstract

A polybutylene terephthalate (PBT) resin composition for laser welding which can be evenly welded to attain high weld strength although it contains PBT as the base. The laser-weldable resin composition comprises 100 parts by weight of a polybutylene terephthalate resin (homopolyester or copolyester) (A), 1 to 50 parts by weight of an elastomer (B) such as a thermoplastic polystyrene elastomer or thermoplastic polyester elastomer, 5 to 100 parts by weight of a polycarbonate resin (C), 1 to 10 parts by weight of a plasticizer (D) (e.g., an aromatic polycarboxylic ester or acrylic plasticizer), and 0 to 100 parts by weight of a filler or reinforcement (E) such as glass fibers. This resin composition gives a molded article in which the light transmittance fluctuates little from part to part. This molded article can hence be evenly laser-welded to a mating material.

Description

Technical field [0001] The present invention relates to a polybutylene terephthalate resin composition having high laser weldability and excellent moldability, and a molded product using the polybutylene terephthalate resin composition. Background technique [0002] Polybutylene terephthalate (PBT) resins can be used for a variety of purposes due to their excellent heat resistance, chemical resistance, electrical properties, mechanical properties, and molding processability. Specific applications include various automotive electrical components (various control units, various sensors, ignition coils, etc.), connectors, switch components, relay components, coil components, and the like. As these parts, airtightness is sometimes required. In order to easily manufacture these parts, bonding methods such as adhesives, hot plate welding, and ultrasonic welding can be used. However, in these joining methods, there are several problems. For example, if an adhesive is used, there are pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02B29C65/00B29C65/16B29K21/00B29K67/00B29K69/00C08K5/00C08K5/10C08K7/14C08L21/00C08L33/00C08L53/02C08L55/02C08L69/00
CPCB29C65/1606B29C65/1616B29C65/1635B29C65/1654B29C65/1674B29C65/1677B29C65/8246B29C66/112B29C66/114B29C66/24244B29C66/53461B29C66/652B29C66/71B29C66/7212B29C66/72143B29C66/7332B29C66/73343B29C66/7392B29C66/73921B29C66/7394B29C66/836B29K2021/00B29K2021/003B29K2067/006B29K2069/00B29K2105/12B29K2309/08B29K2995/0027C08K5/0016C08K7/14C08L53/025C08L55/02C08L67/02C08L67/025C08L69/00C08L2666/18C08L2666/02B29C65/00
Inventor 坂田耕一高山胜智
Owner POLYPLASTICS CO LTD
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