# US 8,465,609 B2 · Process for welding of two polyamide parts

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- Number: US 8,465,609 B2
- Document ID: US8465609B2
- Status: Granted
- Kind: B2
- Application number: 12/528,966
- Filed: 2008-03-10
- Published: 2010-03-04
- Granted: 2013-06-18
- Earliest claimed: 2007-03-15
- Assignees: Dsm IP Assets B.V.
- Applicants: Wilhelmus Josephus Maria Sour; Antonius Maria Vet
- Inventors: Wilhelmus Josephus Maria Sour; Antonius Maria Vet
- Web page: https://patentgrep.com/patent/US8465609B2

## CPC

- B29C 65/06: using friction, e.g. spin welding {(non-plastics elements to plastic elements B29C65/645)}
- B29C 65/18: using heated tools
- B29C 66/71: {characterised by the composition of the plastics material of the parts to be joined (welding bar compositions B29C65/125)}
- B29C 66/73772: {the to-be-joined areas of both parts to be joined being amorphous}
- B29C 66/73774: {the to-be-joined areas of both parts to be joined being semi-crystalline}
- B29C 66/73921: {characterised by the materials of both parts being thermoplastics}
- C08J 5/12: Bonding of a preformed macromolecular material to the same or other solid material such as metal, glass, leather, e.g. using adhesives
- C09J 5/00: Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
- B29C 65/04: Dielectric heating, e.g. high-frequency welding {, i.e. radio frequency welding of plastic materials having dielectric properties, e.g. PVC}
- B29C 65/08: using ultrasonic vibrations {(non-plastics element to plastics elements B29C65/645)}
- B29C 65/16: Laser beams
- B29C 65/20: with direct contact, e.g. using "mirror"
- B29C 66/43441: {with two right angles, e.g. for making T-shaped pieces, H-shaped pieces}
- B29C 66/7212: {characterised by the composition of the fibres}
- B29C 66/73117: {Tg, i.e. glass transition temperature}
- B29K 2105/0005: {containing compounding ingredients (releasing, lubricating or separating agents B29C33/56, fibers B29K2105/08, B29K2105/12; fillers B29K2105/16, recycled material B29K2105/26)}
- B29K 2105/0044: {Stabilisers, e.g. against oxydation, light or heat}
- B29K 2105/005: {Heat sensitisers or absorbers}
- B29K 2305/12: Iron
- B29K 2995/0039: Amorphous
- B29K 2995/004: Semi-crystalline
- C08J 2377/00: Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
- C09J 2477/006: in the substrate
- Y10T 156/10: Methods of surface bonding and/or assembly therefor
- Y10T 403/477: Fusion bond, e.g., weld, etc.
- Y10T 428/1352: Polymer or resin containing [i.e., natural or synthetic]
- Y10T 428/1393: Multilayer [continuous layer]
- Y10T 428/31728: Next to second layer of polyamide
- 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)
- 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)
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The invention relates to a plastic body comprising two polyamide parts welded together, wherein the two polyamide parts consist of a polyamide composition at least one which comprises an iron containing additive. The invention also relates to a welding process for making the plastic body by welding two polyamide parts at least one of which consists of a polyamide composition comprising an iron containing additive.

## Claims

### Claim 1

A process for welding two polyamide parts comprising:
forming a welded joint between the two polyamide parts, wherein
each of the two polyamide parts consists of a polyamide composition comprising a blend of a first polyamide consisting of a semicrystalline polyamide having a melting point of at least 260° C. and a second polyamide consisting of either a polyamide having a melting point of less than 260° C. or an amorphous polyamide having a glass transition temperature of less than 260° C., and optionally additives, and wherein
at least one of the two polyamide parts consists of a polyamide composition comprising an iron containing additive in an amount sufficient to increase strength of the welded joint and/or improve retention of the welded joint at elevated temperature.

### Claim 2 (depends on 1)

The process according to claim 1, wherein each of the two parts consists of a polyamide composition comprising an iron containing additive.

### Claim 3 (depends on 1)

The process according to claim 1, wherein the iron containing additive comprises elementary iron, and/or iron oxide and/or a salt thereof.

### Claim 4 (depends on 3)

The process according to claim 3, wherein the iron containing additive comprises elementary iron.

### Claim 5 (depends on 3)

The process according to claim 3, wherein the iron containing additive has an iron content, relative to the total metal content of the iron containing additive, of at least 75 wt. %.

### Claim 6 (depends on 4)

The process according to claim 4, wherein the iron containing additive comprises finely dispersed elementary iron having a weight average particle size of at most 450 μm.

### Claim 7 (depends on 4)

The process according to claim 4, wherein the iron containing additive comprises finely dispersed elementary iron having a weight average particle size of more than 1 μm.

### Claim 8 (depends on 3)

The process according to claim 3, wherein the iron containing additive comprises iron(II) oxide, iron(III) oxide and/or a combination thereof, a ferrite, and/or an iron phosphorus oxide.

### Claim 9 (depends on 3)

The process according to claim 3, wherein the iron containing additive, comprises an iron oxide; or salt thereof, having a weight average particle size of at most 1 mm.

### Claim 10 (depends on 1)

The process according to claim 1, wherein the iron containing additive is present in an amount of 0.01-10 mass %, relative to the total weight of the polyamide composition.

### Claim 11 (depends on 1)

The process according to claim 1, wherein the polyamide composition comprising the iron containing additive further comprises an additive chosen from the group consisting of fillers, fibres, stabilizers, processing agents and auxiliary additives.

### Claim 12 (depends on 1)

The process according to claim 1, wherein the polyamide composition comprising the iron containing additive further comprises a copper salt, and/or an alkali halide, and/or a pyrophosphate.

### Claim 13 (depends on 1)

The process according to claim 1, wherein the polyamide composition of both polyamide parts comprises an inorganic filler and/or fibrous reinforcing agent.

### Claim 14 (depends on 1)

The process according to claim 1, wherein the step of forming the welded joint is accomplished by conducting vibration welding or hot plate welding.

### Claim 15 (depends on 13)

The process according to claim 13, wherein the step of forming the welded joint is accomplished by vibration welding.

### Claim 16 (depends on 1)

The process according to claim 1, wherein the first polyamide is one selected from the group consisting of polyamide-6,6, polyamide-4,6, a semi-crystalline semi-aromatic polyamide terephthalate and copolymers thereof, and wherein the second polyamide is one selected from polyamide-6 and copolyamides thereof.