# US 11,299,603 B2 · Polyamide resin composition

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- Number: US 11,299,603 B2
- Document ID: US11299603B2
- Status: Granted
- Kind: B2
- Application number: 16/342,784
- Filed: 2017-10-17
- Published: 2019-08-22
- Granted: 2022-04-12
- Earliest claimed: 2016-10-19
- Assignees: Asahi Kasei Kabushiki Kaisha
- Applicants: Asahi Kasei Kabushiki Kaisha
- Inventors: Miho Konishi; Yuki Mori
- Web page: https://patentgrep.com/patent/US11299603B2

## CPC

- C08K 7/14: Glass
- C08K 3/40: Glass
- C08K 9/06: with silicon-containing compounds
- C08K 9/08: Ingredients agglomerated by treatment with a binding agent
- C08L 77/06: Polyamides derived from polyamines and polycarboxylic acids (C08L77/10 takes precedence)
- F02F 1/00: Cylinders; Cylinder heads
- F02F 1/24: Cylinder heads
- F02F 7/00: Casings, e.g. crankcases
- F02M 35/12: Intake silencers {; Sound modulation, transmission or amplification (intake silencers also used as exhaust silencer F01N13/007; filters for compressors F04B39/16)}
- F16H 7/02: with belts; with V-belts
- F16H 7/06: with chains
- G10K 11/162: Selection of materials
- G10K 11/172: using resonance effects
- A47C 7/38: for the head, e.g. detachable
- B60G 21/055: Stabiliser bars
- B60G 2206/11: the arm being a radius or track or torque or steering rod or stabiliser end link
- B60G 2206/71: Light weight materials
- B60G 2206/81012: by injection moulding
- B60K 5/12: Arrangement of engine supports
- B60N 2/80: Head-rests
- C08K 2201/003: Additives being defined by their diameter
- C08L 2205/06: having improved processability or containing aids for moulding methods
- F02F 7/006: {Camshaft or pushrod housings}
- F16F 15/08: with rubber springs {(grommet- or bushing-type resilient mountings F16F1/3732, F16F1/38); with springs made of rubber and metal (arrangement of internal-combustion or jet-propulsion units B60K5/12; mounting of propulsion plants on vessels B63H21/30; mounting of vehicle drivers' cabs B62D33/0604)}
- F16F 2224/02: solids
- F16F 2226/00: Manufacturing; Treatments
- F16G 1/00: Driving-belts (V-belts F16G5/00; conveyor belt B65G)
- F16G 13/02: Driving-chains (specially adapted to gearings with variable gear-ratio F16H9/00)
- 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)
- F02F: CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F16H: GEARING
- G10K: SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- A47C: CHAIRS; SOFAS; BEDS
- B60G: VEHICLE SUSPENSION ARRANGEMENTS (air-cushion vehicles B60V; {cycle suspensions B62K25/00})
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60N: SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
- F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16G: BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR

## Abstract

A polyamide resin composition contains a polyamide resin and an inorganic filler. 90 mass % or more of polyamide 66 is contained relative to 100 mass % of the polyamide resin. The inorganic filler content is ≥30 mass % relative to 100 mass % of the composition. The composition has a solidifying point of ≥210° C. The composition has a spiral flow value of ≥60 cm when the inorganic filler content is ≥30 mass % and <40 mass %, ≥40 cm when the content is ≥40 mass % and ≤50 mass %, and ≥20 cm when the content is >50 mass % and ≤70 mass %. The composition has a strain of ≤3.8% in a 1000-hour tensile creep test under 120° C. and 60 MPa. The composition has a formic acid relative viscosity (VR) of 30<VR<40.

## Claims

### Claim 1

A polyamide resin composition comprising (A) a polyamide resin and (B) an inorganic filler, wherein:
the (A) polyamide resin comprises polyamide 66 in an amount of 90 mass or more relative to 100 mass % of the polyamide resin and a liquidity improver in an amount of from 0.1 to 10 mass % relative to 100 mass % of the polyamide resin;
the (B) inorganic filler is contained in an amount of 30 mass % or more relative to 100 mass % of the polyamide resin composition;
the polyamide resin composition has a solidifying point of 210° C. or more;
the polyamide resin composition has a spiral flow value in a flat spiral mold having a cavity width of 10 mm and a thickness of 2 mm, the spiral flow value being 60 cm or more under the conditions of a set temperature of 285° C., a mold temperature of 80° C., and an injection pressure of 70 MPa when the content of the (B) inorganic filler is 30 mass % or more and less than 40 mass %, being 40 cm or more under the conditions of a set temperature of 285° C., a mold temperature of 80° C., and an injection pressure of 70 MPa when the content of the (B) inorganic filler is 40 mass % or more and not greater than 50 mass %, and being 20 cm or more under the conditions of a set temperature 295° C., a mold temperature of 80° C., and an injection pressure of 70 MPa when the content of the (B) inorganic filler is greater than 50 mass % and not greater than 70 mass %;
the polyamide resin composition has a strain of 3.8% or less measured in a 1000-hour tensile creep test under the conditions of 120° C. and 60 MPa, and
the polyamide resin composition has a formic acid relative viscosity VR in the range of 30<VR<40.

### Claim 2 (depends on 1)

The polyamide resin composition as claimed in claim 1, wherein the polyamide resin composition also has a tensile strength that is measured according to ISO 527, the tensile strength being greater than 195 MPa when the content of the (B) inorganic filler is 30 mass % or more and less than 40 mass %, being greater than 240 MPa when the content of the (B) inorganic filler is 40 mass % or more and not greater than 50 mass %, and being greater than 250 MPa when the content of the (B) inorganic filler is greater than 50 mass % and not greater than 70 mass %.

### Claim 3 (depends on 1)

The polyamide resin composition as claimed in claim 1, wherein the (B) inorganic filler comprises glass fiber.

### Claim 4 (depends on 3)

The polyamide resin composition as claimed in claim 3, wherein the glass fiber has an average minor diameter of 12 μm or less.

### Claim 5 (depends on 3)

The polyamide resin composition as claimed in claim 3, wherein the glass fiber comprises an acid copolymer as a binder.

### Claim 6 (depends on 1)

The polyamide resin composition as claimed in claim 1, wherein the (B) inorganic filler is surface-treated with an amino silane.

### Claim 7 (depends on 1)

A cylinder head cover produced by molding the polyamide resin composition as claimed in claim 1 and having an average product thickness of 2 mm or less.

### Claim 8 (depends on 1)

An oil pan produced by molding the polyimide resin composition as claimed in claim 1.

### Claim 9 (depends on 1)

An engine mount or a torque rod produced by molding the polyamide resin composition as claimed in claim 1.

### Claim 10 (depends on 1)

A head rest component produced by molding the polyamide resin composition as claimed in claim 1.

### Claim 11 (depends on 1)

A resonator produced by molding the polyamide resin composition as claimed in claim 1.

### Claim 12 (depends on 1)

A timing chain component or a timing belt component produced by molding the polyamide resin composition as claimed in claim 1.

### Claim 13 (depends on 2)

The polyamide resin composition as claimed in claim 2, wherein the (B) inorganic filler comprises glass fiber.

### Claim 14

The polyamide resin composition as claimed in claim wherein the (B) inorganic tiller is surface-treated with an amino silane.

### Claim 15 (depends on 13)

The polyamide resin composition as claimed in claim 13, wherein the glass fiber has an average minor diameter of 12 μm or less.

### Claim 16 (depends on 13)

The polyamide resin composition as claimed in claim 13, wherein the glass fiber comprises an acid copolymer as a binder.