Polymer additives for powder coatings

a technology of polymer additives and powder coatings, which is applied in the direction of powdery paints, synthetic resin layered products, coatings, etc., can solve the problems of brittleness of durable powder compositions, non-durable films, and inability to give the desired durability, etc., to achieve improved flow and leveling characteristics, increased flexibility, and increased toughness

Inactive Publication Date: 2007-01-11
ZIEGLER MICHAEL J +4
View PDF16 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The resulting coatings demonstrate increased flexibility, toughness, improved flow and leveling, and reduced gassing, making them suitable for high-impact applications and allowing for better handling and appearance.

Problems solved by technology

Often, the durable powder compositions are brittle and the non-durable films, while flexible, may not give the desired durability.
Such coatings would have widespread application, such as in high impact areas or environments requiring secondary post-forming stages, something that is not currently possible.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0033] An acrylic polymer grafted with caprolactone-based chains modified with anhydride was prepared as follows:

[0034] To 325 parts by weight of a commercially available hydroxyl functional acrylic polymer (JONCRYL 587, from S.C. Johnson & Son) was added 3.25 parts by weight of stannous octoate and 1235 parts by weight of ε-caprolactone. The resultant mixture was heated to react in a nitrogen atmosphere at a temperature of 180° C. The reaction was allowed to progress for 4 hours at that temperature. The reaction was then cooled to 120° C. and 62.6 parts by weight of hexahydrophthalic anhydride were added. The reaction was allowed to progress until no anhydride groups were detected by infrared spectroscopy analysis of the material.

[0035] The reaction product was then cooled, discharged and analyzed. The determined acid value was 17.9 mg KOH / gram, and hydroxy value was 4.9 mg KOH / gram. Analysis of the polymer by GPC (using linear polystyrene standards) showed the polymer to have an...

example 2

[0036] An acrylic polymer grafted with caprolactone-based chains modified with anhydride was prepared as follows:

[0037] To 160 parts by weight of JONCRYL 587 was added 3.42 parts by weight of stannous octoate and 1520 parts by weight of ε-caprolactone. The resultant mixture was heated to react in a nitrogen atmosphere at a temperature of 170° C. The reaction was allowed to progress for 4 hours at that temperature. The reaction was then cooled to 120° C. and 30.8 parts by weight of hexahydrophthalic anhydride were added. The reaction was allowed to progress until no anhydride groups were detected by infrared spectroscopy analysis of the material.

[0038] The reaction product was then cooled, discharged and analyzed. The determined acid value was 9.7 mg KOH / gram, and hydroxy value was 3.2 mg KOH / gram. Analysis of the polymer by GPC (using linear polystyrene standards) showed the polymer to have an Mw value of 215,933, and an Mn value of 9293. The melting temperature was determined to ...

example 3

[0039] An acrylic polymer grafted with caprolactone-based chains was prepared as follows:

[0040] To 355 parts by weight of JONCRYL 587 was added 3.41 parts by weight of stannous octoate and 1349 parts by weight of ε-caprolactone. The resultant mixture was heated to react in a nitrogen atmosphere at a temperature of 180° C. The reaction was allowed to progress for 4 hours at that temperature.

[0041] The reaction product was then cooled, discharged and analyzed. The determined acid value was 2.7 mg KOH / gram, and hydroxy value was 20.7 mg KOH / gram. Analysis of the polymer by GPC (using linear polystyrene standards) showed the polymer to have an Mw value of 66,489, and an Mn value of 4,877. The melting temperature was determined to be 56.3° C. by differential scanning calorimetry, and no glass transition temperature was observed.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
temperatureaaaaaaaaaa
degree of polymerizationaaaaaaaaaa
degree of polymerizationaaaaaaaaaa
Login to View More

Abstract

Comb polymers prepared by reacting an acrylic polyol or a siloxane polyol with a lactone are disclosed. These comb polymers find particular application as additives for powder coating compositions, to improve various performance properties thereof. Powder coating composition comprising the described comb polymers are also disclosed.

Description

FIELD OF THE INVENTION [0001] The present invention relates to powder coatings comprising a polymer additive. More specifically, the polymer additive comprises a polyol to which is grafted linear moieties comprising lactone. BACKGROUND INFORMATION [0002] In recent years, powder coatings have become increasingly popular; because these coatings are inherently low in volatile organic content (VOC), their use significantly reduces air emissions during the application and curing processes. Powder coatings are typically cured by heating the coated substrate to an elevated temperature, such as higher than 125° C. During the curing process, the powder particles melt and spread, and the components of the powder coating react. [0003] Powder coatings used today can be classified broadly in two distinct categories, ultraviolet durable and ultraviolet non-durable. Often, the durable powder compositions are brittle and the non-durable films, while flexible, may not give the desired durability. Th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & AuthorityApplications(United States)
IPC IPC(8): C08L67/00C08L83/00B32B27/00C08F8/00C09D5/03C09D7/00
CPCY10S524/904C09D5/033
InventorZIEGLER, MICHAEL J.RETSCH, WILLIAM H. JR.CHASSER, ANTHONY M.AMBROSE, RONALD R.KULFAN, JACKIE L.
OwnerZIEGLER MICHAEL J