Pipe joint and piping structure

Patent metadata

Field	Value
Publication number	US-11840829-B2
Application number	US-202017439975-A
Country	US
Kind code	B2
Filing date	Mar 19, 2020
Priority date	Mar 22, 2019
Publication date	Dec 12, 2023
Grant date	Dec 12, 2023

Abstract

A pipe joint ( 1 ) comprising: a tubular main body ( 10 ) having a flow path inside, which is formed of a resin comprising a copolymer having one or more selected from a vinyl cyanide monomer unit and an acrylic monomer unit, a rubber component, and an aromatic vinyl monomer unit; and a socket section ( 20 a ) integrally formed with the main body ( 10 ), wherein: the main body ( 10 ) has a foamed resin layer ( 30 ) and a non-foamed resin layer ( 50 ) covering the foamed resin layer ( 30 ); the amount of the rubber component in the foamed resin layer ( 30 ) as determined by pyrolysis-gas chromatography/mass spectrometry is within a specific range; the amount of the rubber component in the non-foamed resin layer ( 50 ) is within a specific range; and a ratio (L a /L a ) of length (L a ) from a base end ( 21 a ) to an opening end ( 22 a ) of the socket section ( 20 a ) to a thickness (d a ) of the socket section ( 20 a ) at the opening end is 2.0 or more and 10.0 or less.

First claim

The invention claimed is:

1. A pipe joint comprising a tubular main body and a socket section integrally formed with the tubular main body,
wherein the tubular main body has a flow path inside, and is formed of a resin comprising an acrylate polymer and a copolymer having
(i) a vinyl cyanide monomer unit selected from the group consisting of acrylonitrile, methacrylonitrile, and mixtures thereof,
(ii) a rubber component selected from the group consisting of diene rubber, acrylic rubber, and mixtures thereof, and
(iii) an aromatic vinyl monomer unit selected from the group consisting of styrene, α-methylstyrene, β-methylstyrene, 4-methylstyrene, β-bromostyrene, and mixtures thereof,
wherein an amount of the vinyl cyanide monomer unit is 15% by mass or more to 45% by mass or less, based on a total mass of the resin,
wherein the tubular main body has a foamed resin layer and a non-foamed resin layer covering the foamed resin layer,
wherein an amount of the rubber component in the foamed resin layer is 10% by mass or more and 45% by mass or less, based on a total mass of the resin contained in the foamed resin layer, as determined by pyrolysis-gas chromatography/mass spectrometry,
wherein an amount of the rubber component in the non-foamed resin layer is 10% by mass or more and 45% by mass or less, based on a total mass of the resin contained in the non-foamed resin layer, as determined by pyrolysis-gas chromatography/mass spectrometry, and
wherein a ratio L/d of length L from a base end to an opening end of the socket section to a thickness d of the socket section at the opening end is 4.2 or more and 9.0 or less.

2. The pipe joint according to claim 1 , wherein the main body has a thermal resistance of 0.04 K/W or more.

3. A piping structure comprising the pipe joint of claim 1 , and a pipe inserted into and connected to the socket section of the pipe joint.

4. A piping structure comprising the pipe joint of claim 2 , and a pipe inserted into and connected to the socket section of the pipe joint.

5. The pipe joint according to claim 1 , wherein the amount of the vinyl cyanide monomer unit is 41% by mass or more and 45% by mass or less, based on the total mass of the resin, and the ratio L/d is 4.2 or more and 5.9 or less.

6. A pipe joint comprising a tubular main body and a socket section integrally formed with the main body,
wherein the tubular main body has a flow path inside, and is formed of a resin comprising an acrylate polymer and a copolymer having
(i) a vinyl cyanide monomer unit,
(ii) a rubber component, and
(iii) an aromatic vinyl monomer unit,
wherein an amount of the vinyl cyanide monomer unit is 15% by mass or more to 45% by mass or less, based on the total mass of the resin,
wherein the main body has a foamed resin layer and a non-foamed resin layer covering the foamed resin layer,
wherein the amount of the rubber component in the foamed resin layer is 10% by mass or more and 45% by mass or less, based on a total mass of the resin contained in the foamed resin layer, as determined by pyrolysis-gas chromatography/mass spectrometry,
wherein the amount of the rubber component in the non-foamed resin layer is 10% by mass or more and 45% by mass or less, based on a total mass of the resin contained in the non-foamed resin layer, as determined by pyrolysis-gas chromatography/mass spectrometry,
wherein a ratio L/d of length L from a base end to an opening end of the socket section to a thickness d of the socket section at the opening end is 4.2 or more and 9.0 or less, and
wherein the main body has a thermal resistance of 0.04 K/W or more.

7. The pipe joint according to claim 6 , wherein the vinyl cyanide monomer unit is selected from the group consisting of acrylonitrile, methacrylonitrile, and mixtures thereof; the rubber component is selected from the group consisting of diene rubber, acrylic rubber, and mixtures thereof; and the aromatic vinyl monomer unit is selected from the group consisting of styrene, α-methylstyrene, β-methylstyrene, 4-methylstyrene, β-bromostyrene, and mixtures thereof.

8. A piping structure comprising the pipe joint of claim 6 , and a pipe inserted into and connected to the socket section of the pipe joint.

9. A piping structure comprising the pipe joint of claim 7 , and a pipe inserted into and connected to the socket section of the pipe joint.

10. The pipe joint according to claim 6 , wherein the amount of the vinyl cyanide monomer unit is 41% by mass or more and 45% by mass or less, based on the total mass of the resin, and the ratio L/d is 4.2 or more and 5.9 or less.

Assignees

• Sekisui Chemical Co Ltd

Inventors

• Hisashuku Daiki

Classifications

• E03C1/12 Primary

  Plumbing installations for waste water; Basins or fountains connected thereto (drainage devices in floors E03F5/04); Sinks {(wash-basins not connected to the waste-pipe A47K1/04)} · CPC title

• B32B1/08

  Tubular products · CPC title

• B32B27/065

  of foam · CPC title

• B32B27/302

  comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers · CPC title

• C08J9/04

  using blowing gases generated by a previously added blowing agent · CPC title