US 8,940,397 B2 · Weatherable and abrasion resistant coating systems for polymeric substrates

Abstract

Disclosed herein is a primer composition comprising an inorganic UV absorbing agent and a polymer selected from (i) a copolycarbonate, and (ii) a polyurethane obtained by reaction of a polyisocyanate and a copolycarbonate diol. Also disclosed is a coated article comprising a polymeric substrate, a primer layer disposed on at least one surface of said substrate, and an abrasion-resistant layer disposed on said primer layer, where the primer layer is made from the primer composition of the invention.

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Drawings

Claims20

Dependent claims

A primer coating composition comprising (1) an inorganic UV absorbing agent selected from the group consisting of CeOx, TiOx, ZnOx, ZrOx, and combinations thereof, wherein x is 1-2;

and (2) a polymer selected from (i) a linear copolycarbonate comprising repeating units A and B, and (ii) a polyurethane obtained by reaction of a polyisocyanate and a linear copolycarbonate diol comprising repeating units A and B,
wherein repeating units A and B are represented by the following formulae:
wherein the molar ratio of units (A) to units (B) is in the range of from about 9:1 to about 1:9, and wherein R1 is a divalent C8 to C12 alicyclic group, R2 is a divalent group selected from the group consisting of ethylene, propylene, and combinations thereof, n is an integer ranging from 4 to 40;
wherein the UV absorbing agent is present in an amount of from about 33 weight percent to about 80 weight percent based on a total dry weight of the primer composition, wherein the primer composition upon drying and curing forms an optically transparent coating.

1 more element

Dependencies are inferred from the claim text.

Description6,323 words

Summary961 words

#The present invention relates to weatherable and abrasion resistant coating systems for polymeric substrates.

#Polymeric materials, such as polycarbonate, are promising alternatives to glass for use as structural material in a variety of applications, including automotive, transportation and architectural glazing applications, where increased design freedom, weight savings, and improved safety features are in high demand. Plain polycarbonate substrates, however, are limited by their lack of abrasion, chemical, UV and weather resistance, and therefore need to be protected with optically transparent coatings that alleviate above limitations in the aforementioned applications.

#To impart abrasion resistance to the polymeric materials, polycarbonate substrates are in general coated with thermally curable silicone hardcoat. The poor weatherability of polycarbonate, on the other hand, is addressed with addition of organic or inorganic UV-absorbing materials in the silicone hardcoat layer. However, incorporation of UV absorbers, especially organic based, in the thermal curable silicone layer, often leads to inferior abrasion resistance performance.

Brief description of the drawings4 figures

#FIG. 1 is a diagrammatic illustration of a coated article according to one embodiment of the invention.

#FIG. 2 is a diagrammatic illustration of a coated article according to another embodiment of the invention.

#FIG. 3 shows cross-section TEM analysis of an article coated according to the present invention.

Detailed description5,286 words

#In one embodiment of the invention, there is provided a primer composition suitable for providing adhesion of an abrasion-resistant layer to a substrate. The abrasion-resistant layer can be a thermal/UV cured organic-based topcoat or a hydrogenated silicon oxycarbide layer.

#The primer composition of the invention contains (1) at least one inorganic absorbing agent, and (2) a polymer selected from (i) a copolycarbonate, and (ii) a polyurethane derived from a copolycarbonate diol. The polymer severs as a matrix to hold the inorganic absorbing agent.

#The inorganic absorbing agent is not particularly limited. Suitable examples include, but are not limited to, CeOx, TiOx, ZnOx, ZrOx and mixture of these metal oxides, where x is 1-2. In one embodiment, the inorganic absorbing agent is CeO2.

Facts

Application

13/036,348Filed 28 Feb 2011

Published

US 2012/0219803 A130 Aug 2012

Granted

27 Jan 2015

Term ends

30 May 2032

Estimated · how

20 years from earliest known nonprovisional domestic filing plus recorded patent term adjustment, including 457 days of adjustment. Maintenance-fee lapses, terminal disclaimers and statutory extensions have not been checked. The continuity chain may be incomplete; this is not an enforceability determination.

Classification32 codes

C09D 169/00
Coating compositions based on polycarbonates
C08G 18/10
Processes: prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
C08G 18/44
Polycondensates having carboxylic or carbonic ester groups in the main chain: polycarbonates
C08J 7/042
Coating: with two or more layers, where at least one layer of a composition contains a polymer binder

Timeline

28 Feb 2011Application filedUS 13/036,348
10 May 2011Assigned to Momentive Performance Materials Inc.assignment of assignor's interest
28 Mar 2012Assigned to Jpmorgan Chase Bank, N.A.security agreement
31 May 2012Assigned to Bank of New York Mellon Trust Company, N.A., thesecurity agreement
30 Aug 2012PublishedUS 2012/0219803 A1
3 Apr 2013Assigned to Bank of New York Mellon Trust Company, N.A., thepatent security agreement
29 Apr 2013Assigned to Jpmorgan Chase Bank, N.A.security agreement
27 Oct 2014Assigned to The Bank of New York Mellon Trust Company, N.A., AS Collateral Agentsecurity interest
27 Oct 2014Assigned to The Bank of New York Mellon Trust Company, N.A., AS Collateral Agentsecurity interest
30 Oct 2014Assigned to Momentive Performance Materials Inc.termination and release of security interest in patent rights
30 Oct 2014Assigned to Momentive Performance Materials Inc.termination and release of security interest in patent rights
27 Jan 2015GrantedUS 8,940,397 B2
6 Mar 2015Assigned to Bokf, Na, AS Successor Collateral Agentnotice of change of collateral agent - assignment of security interest in intellectual property
6 Mar 2015Assigned to Bokf, Na, AS Successor Collateral Agentnotice of change of collateral agent - assignment of security interest in intellectual property - second lien
15 May 2019Assigned to Momentive Performance Materials Inc.release of security interest
15 May 2019Assigned to Momentive Performance Materials Inc.release of security interest
21 May 2019Assigned to Momentive Performance Materials Inc.termination and release of security interest in patents
5 Jun 2019Assigned to Bnp Paribas, AS Administrative Agentfirst lien term loan patent agreement
5 Jun 2019Assigned to Kookmin Bank, New York Branch, AS Administrative Agentsecond lien term loan patent agreement
5 Jun 2019Assigned to Citibank, N.A., AS Administrative Agentabl patent agreement
30 Mar 2023Assigned to Momentive Performance Materials Inc.release of security interest
30 Mar 2023Assigned to Kookmin Bank New York Branchsecurity interest
31 Mar 2023Assigned to Jpmorgan Chase Bank, N.A.first lien term loan patent security agreement
31 Mar 2023Assigned to Momentive Performance Materials Inc.termination and release of security interest in patents
4 May 2023Assigned to Momentive Performance Materials Inc.termination and release of security interest in patent rights
18 Jul 2025Assigned to Momentive Performance Materials Inc.release of security interest
22 Oct 2025Assigned to Momentive Performance Materials Inc.release of security interest in patents previously recorded at reel/frame (063213/0472)
12 Oct 2026TodayWithin its term
30 May 2032Term endsEstimated, includes 457 days of adjustment

Weatherable and abrasion resistant coating systems for polymeric substrates

Life of this patent

Weatherable and abrasion resistant coating systems for polymeric substrates

Life of this patent

Life of this patent

Abstract

Drawings

Drawings

Claims20

Description6,323 words

Drawings

Classification32 codes

Life of this patent

Description6,323 words