# US 2014/0194569 A1 · Thin-wall article

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- Number: US 2014/0194569 A1
- Document ID: US20140194569A1
- Status: Published application
- Kind: A1
- Application number: 13/824,027
- Filed: 2012-08-07
- Published: 2014-07-10
- Earliest claimed: 2011-09-12
- Assignees: Mitsubishi Gas Chemical Compamy, Inc.
- Inventors: Jun Mitadera; Takahiro Takano
- Web page: https://patentgrep.com/patent/US20140194569A1

## CPC

- C08G 69/26: derived from polyamines and polycarboxylic acids
- B29C 45/0001: {characterised by the choice of material}
- B29C 45/74: of the injection unit
- C08G 69/265: {from at least two different diamines or at least two different dicarboxylic acids}
- C08J 5/00: Manufacture of articles or shaped materials containing macromolecular substances (manufacture of semi-permeable membranes B01D67/00 - B01D71/00)
- C08K 7/02: Fibres or whiskers
- C08L 77/06: Polyamides derived from polyamines and polycarboxylic acids (C08L77/10 takes precedence)
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- 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)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

Provided is a thin-wall article formed from a polyamide resin which can be stably produced with little variation in mechanical properties such as flexural strength, flexural modulus and impact resistance. A thin-wall article formed by molding a polyamide resin (C) obtained by polycondensing a diamine (A) and a dicarboxylic acid (B) or a polyamide resin composition containing the polyamide resin, wherein 70 mol % or more of a diamine structural unit is derived from xylylenediamine and the polyamide resin has a melt viscosity (i) of 50 to 200 Pa·s as measured at a temperature of the melting point plus 10° C. for a holding time of 6 minutes at a shear rate of 122 sec−1.

## Claims

### Claim 1

A thin-wall article formed by molding (i) a polyamide resin obtained by polycondensing a diamine and a dicarboxylic acid, or (ii) a polyamide resin composition comprising the polyamide resin,
wherein 70 mol % or more of a diamine structural unit is derived from xylylenediamine and the polyamide resin has a first melt viscosity of 50 to 200 Pa·s as measured at a temperature of a melting point plus 10° C. for a holding time of 6 minutes at a shear rate of 122 sec−1.

### Claim 2 (depends on 1)

The thin-wall article of claim 1, wherein the polyamide resin has a second melt viscosity of 50 to 200 Pa·s as measured at a temperature of the melting point plus 10° C. for a holding time of 15 minutes at a shear rate of 122 sec−1.

### Claim 3 (depends on 2)

The thin-wall article of claim 2, wherein the first and second melt viscosities differ by 100 Pa·s or less.

### Claim 4 (depends on 1)

The thin-wall article of claim 1, wherein the polyamide resin has a molecular weight distribution of 2.1 to 3.1.

### Claim 5 (depends on 1)

The thin-wall article of claim 1, wherein the polyamide resin comprises 0.5 to 5% by mass of a component having a molecular weight of 1,000 or less.

### Claim 6 (depends on 1)

The thin-wall article of claim 1, wherein the polyamide resin has a crystallization half time of 1 to 100 seconds.

### Claim 7 (depends on 1)

The thin-wall article of claim 1, wherein the polyamide resin has a crystallization heat of 5 to 50 J/g.

### Claim 8 (depends on 1)

The thin-wall article of claim 1, wherein the xylylenediamine is m-xylylenediamine, p-xylylenediamine or a mixture of m-xylylenediamine and p-xylylenediamine.

### Claim 9 (depends on 1)

The thin-wall article of claim 1, wherein the dicarboxylic acid is sebacic acid.

### Claim 10 (depends on 1)

The thin-wall article of claim 1, wherein the polyamide resin composition comprises 10 to 100 parts by mass of a fibrous filler per 100 parts by mass of the polyamide resin.

### Claim 11 (depends on 1)

The thin-wall article of claim 1, wherein the polyamide resin composition comprises 0.1 to 10 parts by mass of a nucleating agent per 100 parts by mass of the polyamide resin.

### Claim 12 (depends on 1)

The thin-wall article of claim 1, wherein the polyamide resin composition comprises 0.01 to 1 part by mass of a stabilizer per 100 parts by mass of the polyamide resin.

### Claim 13 (depends on 1)

The thin-wall article of claim 1, which is a molded article selected from the group consisting of an electric connector, an insulating spacer, an electric/electronic enclosure, a circuit board, a gasket, a reflector for an LED, an LED mounting board, and a heat sink element.

### Claim 14

A process for manufacturing a thin-wall article, comprising:
injection-molding a polyamide resin obtained by polycondensing a diamine and a dicarboxylic acid, or a polyamide composition comprising the polyamide resin,
wherein 70 mol % or more of a diamine structural unit is derived from xylylenediamine and the polyamide resin has a first melt viscosity of 50 to 200 Pa·s as measured at a temperature of a melting point plus 10° C. for a holding time of 6 minutes at a shear rate of 122 sec−1, and wherein an inlet temperature (Tin) and an outlet temperature (Tout) of a cylinder in which the polyamide resin or the polyamide resin composition comprising the polyamide resin is melted satisfy the following relation (1):
Tout≧Tin+20° C. (1).

### Claim 15 (depends on 14)

The process of claim 14, wherein the inlet temperature (Tin) and the outlet temperature (Tout) of the cylinder satisfy the following relations (2) and (3) with the melting point (Tm) of the polyamide resin:
Tm+60° C.≧Tout≧Tm+10° C. (2)
Tm+40° C.≧Tin≧Tm−50° C. (3).

### Claim 16 (depends on 1)

The thin-wall article of claim 1, wherein the first melt viscosity is 90 to 160 Pa·s.

### Claim 17 (depends on 2)

The thin-wall article of claim 2, wherein the second melt viscosity is 80 to 170 Pa·s.

### Claim 18 (depends on 2)

The thin-wall article of claim 2, wherein the first and second melt viscosities differ by 30 Pa·s or less.

### Claim 19 (depends on 1)

The thin-wall article of claim 1, wherein the polyamide resin has a molecular weight distribution of 2.3 to 2.9.

### Claim 20 (depends on 1)

The thin-wall article of claim 1, wherein the polyamide resin comprises 0.5 to 5% by mass of a component having a molecular weight of 100 to 1,000.