# US 9,434,839 B2 · Polybutylene terephthalate resin composition and welded body

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- Number: US 9,434,839 B2
- Document ID: US9434839B2
- Status: Granted
- Kind: B2
- Application number: 14/348,084
- Filed: 2012-09-27
- Published: 2014-10-30
- Granted: 2016-09-06
- Earliest claimed: 2011-09-30
- Assignees: WinTech Polymer Ltd.
- Applicants: WinTech Polymer Ltd.
- Inventors: Kouichi Sakata
- Web page: https://patentgrep.com/patent/US9434839B2

## CPC

- C08L 67/03: the dicarboxylic acids and dihydroxy compounds having the carboxyl- and the hydroxy groups directly linked to aromatic rings
- B29C 65/02: by heating, with or without pressure
- B29C 65/06: using friction, e.g. spin welding {(non-plastics elements to plastic elements B29C65/645)}
- B29C 65/08: using ultrasonic vibrations {(non-plastics element to plastics elements B29C65/645)}
- B29C 65/8215: {Tensile tests}
- B29C 66/114: {Single butt joints}
- B29C 66/12443: {having the tongue substantially in the middle}
- B29C 66/12449: {being asymmetric (B29C66/12445 takes precedence)}
- B29C 66/12469: {being asymmetric}
- B29C 66/131: {Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area}
- B29C 66/1312: {Single flange to flange joints, the parts to be joined being rigid (the parts to be joined being flexible B29C66/133)}
- B29C 66/30223: {said melt initiators being rib-like}
- B29C 66/322: {Providing cavities in the joined article to collect the burr}
- B29C 66/54: {Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles}
- B29C 66/71: {characterised by the composition of the plastics material of the parts to be joined (welding bar compositions B29C65/125)}
- B32B 27/36: comprising polyesters
- C08K 3/013: Fillers, pigments or reinforcing additives
- C08K 7/14: Glass
- C08L 51/06: grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
- C08L 67/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence)
- B29C 65/0609: {characterised by the movement of the parts to be joined (B29C65/0672 takes precedence)}
- B29C 65/0672: {Spin welding}
- B29C 65/14: using wave energy {, i.e. electromagnetic radiation,} or particle radiation {(using mechanical waves B29C65/06; using ultrasonic waves B29C65/08; pressing means transparent to electromagnetic radiation B29C66/81267)}
- B29C 65/16: Laser beams
- B29C 65/20: with direct contact, e.g. using "mirror"
- B32B 37/04: characterised by the partial melting of at least one layer
- B32B 37/06: characterised by the heating method
- B32B 2367/00: Polyesters, e.g. PET, i.e. polyethylene terephthalate
- C08G 63/16: Dicarboxylic acids and dihydroxy compounds
- C08G 63/181: Acids containing aromatic rings
- C08G 63/183: Terephthalic acids
- C08J 5/121: {by heating}
- C08J 2300/26: Elastomers
- C08J 2367/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds; (C08J2367/06 takes precedence)
- C08J 2367/03: the dicarboxylic acids and dihydroxy compounds having the hydroxy and the carboxyl groups directly linked to aromatic rings
- Y10T 428/31786: Of polyester [e.g., alkyd, etc.]
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

To provide a polybutylene terephthalate resin composition offering excellent flowability, wherein the resin composition raises the weld strength and heat shock resistance of a welded body obtained by welding together molded products obtained by molding the polybutylene terephthalate resin composition. [Solution] A polybutylene terephthalate resin composition comprising a polybutylene terephthalate resin (A) having a weight-average molecular weight of 60,000-80,000 inclusive and an inorganic filler (B). Preferably, also included is 5-20 mass parts of an elastomer (C) relative to 100 mass parts of the polybutylene terephthalate resin (A).

## Claims

### Claim 1

A method of obtaining a welded body, comprising:
providing at least two molded parts, each being composed of a polybutylene terephthalate resin composition, wherein the polybutylene terephthalate resin composition consisting of a thermoplastic resin blend, and an inorganic filler, wherein the thermoplastic resin blend consists of an unmodified polybutylene terephthalate resin and optionally an elastomer, where the weight-average molecular weight of the unmodified polybutylene terephthalate resin is 60,000 or more and 80,000 or less, wherein if the optional elastomer is present in the polybutylene terephthalate resin composition, the composition contains the optional elastomer in an amount of 5 to 20 parts by mass based on 100 parts by mass of the polybutylene terephthalate resin;
placing the molded parts to abut each other at a contact surface;
moving the abutted molded parts relative to each other such that frictional heat causes the abutted molded parts to melt in the vicinity of the contact surface and causes melted polybutylene terephthalate resin composition from the abutted molded parts to flow and mix in vicinity of the contact surface; and
cooling the melted polybutylene terephthalate thereby adhering the abutted molded parts into a single body.

### Claim 2 (depends on 1)

The method of claim 1, wherein the weight-average molecular weight of the unmodified polybutylene terephthalate resin is 66,500 or more and 75,000 or less.

### Claim 3 (depends on 1)

The method of claim 1, wherein the unmodified polybutylene terephthalate resin has a crystallization temperature of 190° C. or higher.