Siloxane-based pipe coatings

Patent metadata

Field	Value
Publication number	US-10053598-B2
Application number	US-201314408863-A
Country	US
Kind code	B2
Filing date	Jul 1, 2013
Priority date	Jul 3, 2012
Publication date	Aug 21, 2018
Grant date	Aug 21, 2018

Abstract

Siloxane-based pipe coatings include a hot melt processable siloxane-based elastomeric polymer, and may optionally contain fillers and additives. The siloxane-based elastomeric polymer is a urea-containing segmented copolymer or an oxamide-containing segmented copolymer. The coatings are substantially free of tackifying resins and are non-tacky and non-adhesive until heated to a temperature of at least 50 C.

First claim

What is claimed is:

1. A coated pipe comprising:
a pipe comprising an interior surface and an exterior surface; and
a coating that is hot melt coated directly applied onto the exterior surface of the pipe, the coating comprising:
a hot melt processable siloxane-based elastomeric polymer, wherein the siloxane-based elastomeric polymer comprises a segmented copolymer containing at least two repeat units of Formula 2:

wherein each R 1 is independently an alkyl, haloalkyl, aralkyl, alkenyl, aryl, or aryl substituted with an alkyl, alkoxy, or halo;
each Y is independently an alkylene, aralkylene, or a combination thereof;
subscript a is independently an integer of 40 to 1500;
subscript b is an integer of 1 to 10;
G is a divalent group that is the residue unit that is equal to a diamine of formula R 3 HN-G-NHR 3 minus the two NHR 3 groups;
each R 3 is hydrogen or an alkyl having 1 to 10 carbon atoms, or R 3 taken together with G and with the nitrogen to which they are both attached forms a heterocyclic group;
each asterisk (*) indicates a site of attachment of the repeat unit to another group in the copolymer; and

wherein the coating is non-tacky and non-adhesive to polar substrates at a temperature of less than 50° C. and is adhesive to polar substrates at a temperature of greater than 50° C. up to a temperature of 10° C. below the decomposition temperature of the siloxane-based elastomeric polymer;
wherein the coating comprises a multi-layer coating, the multi-layer coating comprises a first coating layer in contact with the exterior of the pipe wherein the first coating layer comprises the hot melt processable siloxane-based elastomeric polymer, and at least one additional coating layer in contact with the first coating layer, wherein the at least one additional coating layer comprises a siloxane-based elastomeric polymer and at least one filler material and wherein the first layer has a thickness of 100 micrometers to 1 millimeter and the at least one additional coating or coatings have a thickness of 1 millimeter to 10 centimeters.

2. The coated pipe of claim 1 , wherein the coating is substantially free of tackifying resin.

3. The coated pipe of claim 1 , wherein the at least one filler material comprises polypropylene, glass bubbles, hollow ceramic microspheres, or a combination thereof.

4. The coated pipe of claim 1 , wherein the first coating layer of the multi-layer coating comprises at least one filler material.

5. The coated pipe of claim 4 , wherein the at least one filler material comprises polypropylene, glass bubbles, hollow ceramic microspheres, or a combination thereof.

6. The article of claim 1 , wherein the coating is optically transparent.

Assignees

• 3M Innovative Properties Co

Inventors

• Yalcin Baris
• Gunes Ibrahim S
• Sherman Audrey A
• Hunter Robert W

Classifications

• C08G77/455

  containing polyamide, polyesteramide or polyimide sequences · CPC title

• B05D3/007

  After-treatment · CPC title

• B05D2254/02

  Applying the material on the exterior of the tube · CPC title

• B29K2083/00

  Use of polymers having silicon, with or without sulfur, nitrogen, oxygen, or carbon only, in the main chain, as moulding material · CPC title

• C09D183/04 Primary

  Polysiloxanes · CPC title