Primers for use with solvent cements

Patent metadata

Field	Value
Publication number	US-11951689-B2
Application number	US-202217805069-A
Country	US
Kind code	B2
Filing date	Jun 2, 2022
Priority date	Nov 23, 2020
Publication date	Apr 9, 2024
Grant date	Apr 9, 2024

Abstract

Provided are primer formulations for solvent cement bonding comprising cyclopentanone and, optionally, at least one additional organic solvent. The primer formulations are effective for solvent cement bonding plastic components together, wherein the plastic components may include ABS, PVC, or CPVC pipes and/or fittings.

First claim

What is claimed:

1. A THF-free primer formulation for use with solvent cements, wherein the primer formulation consists of:
cyclopentanone in an amount of 30 wt % to 50 wt % based on the total weight of the formulation;
40% to 55% acetone based on the total weight of the formulation,
at least one additional organic solvent selected from the group consisting of methyl ethyl ketone, cyclohexanone, N-methyl-2-pyrrolidone, and mixtures thereof;
optionally, one or more fillers or additives; and
optionally, a colorant composition;
wherein the primer formulation is configured to bond components having resin-based surfaces and is capable of dissolving at least 10% of the resin-based surfaces.

2. A THF-free primer formulation for use with solvent cements to bond components having a resin-based surface, wherein the primer formulation consists of:
cyclopentanone in an amount of 45 wt % based on the total weight of the formulation;
up to 55% acetone based on the total weight of the formulation; and
a colorant composition;
wherein the primer formulation is configured to dissolve at least 10% of the resin-based surface.

3. A THF-free primer formulation for use with solvent cements to bond components having a resin-based surface, wherein the primer formulation consists of:
cyclopentanone in an amount of 40 wt % based on the total weight of the formulation;
up to 40% acetone based on the total weight of the formulation;
up to 20% methyl ethyl ketone, and
a colorant composition;
wherein the primer formulation is configured to dissolve at least 10% of the resin-based surface.

Assignees

• Oatey Co

Inventors

• Parhar Amrit

Classifications

• C09D7/20

  Diluents or solvents · CPC title

• C09D5/002

  Priming paints (C09D5/08 takes precedence) · CPC title

• B29C66/026 Primary

  Chemical pre-treatments (B29C66/028 takes precedence) · CPC title

• B29C65/4895

  Solvent bonding, i.e. the surfaces of the parts to be joined being treated with solvents, swelling or softening agents, without adhesives · CPC title

• B29C66/71

  characterised by the composition of the plastics material of the parts to be joined (welding bar compositions B29C65/125) · CPC title