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Dendritic polyurethane coating

A dendritic coating technology, applied in polyurea/polyurethane coatings, thixotropic coatings, antifouling/underwater coatings, etc., can solve problems such as weathering, affecting normal use, and environmental conditions

Active Publication Date: 2010-03-24
NIPSEA TECH PTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these and other traditional coatings are still highly susceptible to scratching, chipping, or damage from cleaning and maintenance, to weathering, environmental conditions, manufacturing and distribution processes, and thus normal use

Method used

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  • Dendritic polyurethane coating
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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0141] In the preparation of the coatings of the present invention, the hydroxyl functional dendritic polyesters are used as crosslinking building blocks and flexible body crosslinkers. The use of hydroxy-functionalized dendritic polyesters of the highly cross-linked polyurethanes of the present invention resulting from cross-linking with polyisocyanates tends to increase the glass transition temperature, Tg, of the resulting resin. In general, the higher the glass transition temperature, the harder the coating surface as measured by methods such as the Shore-hardness test.

[0142] To maximize crosslinking and optimize the performance of crosslinked coatings, stoichiometric ratios of acrylic polyols, hydroxyl functional dendritic polyesters, hydroxyl functional silicone polyacrylate resins and / or fluorosurfactants can be combined with poly isocyanates react. The reaction ratio can be calculated based on the equivalent weights of the hydroxy-functional dendritic polyester, ac...

Embodiment 1

[0155] Example 1 illustrates the preparation of a two-component dendritic polyurethane clearcoat. Part A refers to the resin component, while component B refers to the crosslinker component, or sometimes interchangeably referred to as the "activator" component in this description. Part A and Part B were mixed 1:1 by volume.

[0156] Step 1: Part (A)

[0157] Charge 4-6 g of BOLTORN into a 200 mL round bottom sealed flask (enclosed flask) Hydroxy-functional dendritic polyester (Perstorp Specialty Chemicals, Perstorp, Switzerland) and 12 g of anhydrous acetone. The material was stirred for 5 to 10 minutes.

[0158] Step 2: Part (A)

[0159] Charge 20 to 30 g of G CURE into a separate 100 mL round bottom flask (Cognis Polymers, Cincinnati, OH). This flask will be used as the base mixing vessel to generate part (A) resin.

[0160] Step 3: Part (A)

[0161]Using the 100 ml round bottom flask described in step 2, add 15 to 20 g of the dendritic polyester solution described...

Embodiment 3

[0224] Coatings were tested at Eastern Michigan University through Stonebridge Technical Services. The results, summarized in Table 1, demonstrate that the coatings described herein are comparable to recent automotive OEM aftermarket polyurethane clear coatings, including PPG’s formulated with nanoparticles. (US Published Patent Application Nos. 2003 / 0162876 and 2003 / 0162015)), providing far superior performance.

[0225] The coating compositions described herein are characterized by low viscosity to facilitate spray application and chemical adhesion to coatings including painted metal, aluminum, painted plastics, certain plastics, fiberglass, wood, epoxies, acrylics, and most Polyurethane based paints and powder coatings on various substrates. The coating composition is characterized by measuring the coating viscosity at room temperature (about 18° C.) for 15 to 18 seconds using a No. 2 (#2) Zahn Cup viscosity cup.

[0226] Table 1

[0227] sample

[0228] ...

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Abstract

The invention herein relates to a surface protective dendritic polymer composition and to the cross-linked surface protective coating formed therefrom.

Description

[0001] related application [0002] This application claims priority to U.S. Provisional Patent Application Serial No. 60 / 918,517, filed March 15, 2007, and U.S. Patent Application Serial No. 12 / 049,075, filed March 14, 2008, which It is hereby incorporated by reference in its entirety, including any drawings, if listed. technical field [0003] This invention relates to polymeric protective coatings for surfaces. In particular, the present invention relates to clear polymeric protective coatings for painted surfaces such as, but not limited to, those found in the automotive, marine and aerospace industries. Background technique [0004] Surfaces, especially painted surfaces that are exposed to the environment, can be damaged by factors such as water, snow, ice, heat, dust, smoke, moisture, bird droppings, grime, salt, chemical attack and acidic precipitation. This is especially true for painted surfaces such as on motor vehicles, ships and aircraft. Painted surfaces can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D3/02B05D1/36C09D7/62
CPCC08G18/4241C08G18/6295C08K3/22C09D175/04C09D7/1225C09D5/16C08K9/10C08G18/6275C09D5/04C09D201/005C09D7/62Y10T428/254Y10T428/25Y10T428/31551C08L2666/54
Inventor 托马斯·F·乔特
Owner NIPSEA TECH PTE
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