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Flexible polyurethane material

a polyurethane and flexible technology, applied in the field of flexible polyurethane materials, can solve the problems of rigid polyurethanes that are susceptible to abrasion and scratching, materials that do not demonstrate an appropriate level of self-healing, and specific substrates that are not suitable for use with conventional polyurethanes, etc., to achieve the flexibility of polyurethane, reduce the tendency of polyurethane, and weather resistant properties

Inactive Publication Date: 2018-03-27
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a polyurethane coating that can be applied to various substrates and cured to form a tack-free, flexible, durable, and weather-resistant coating. The polyurethane has good adhesion to different surfaces and can be used in various environments. The flexibility of the polyurethane is achieved through the use of polyether segments resulting in a polyurethane with a low polyether content. The polyurethane has a low Shore A hardness, high storage modulus, and high flexural modulus. It also exhibits self-healing characteristics and remains clear and not yellowing upon exposure to environmental conditions. The durability and weathering properties of the polyurethane make it ideal for applications in various environments. The polyurethane can be applied to various substrates, including wood, polymeric materials, fiber reinforced polymers, metal, or combinations thereof.

Problems solved by technology

Rigid polyurethanes are susceptible to abrasion and scratching.
Additionally, the materials do not demonstrate an appropriate level of self-healing.
However, some specific substrates are not suitable for use with conventional polyurethanes.
Some substrates are susceptible to absorbing an amount of moisture which can react with the polyurethane to form bubbles in the cured polyurethane.
This reaction results in the release of carbon dioxide which generally becomes trapped in the polyurethane.
The occurrence of outgassing in a cured polyurethane is aesthetically undesirable.
The solvent based polyurethanes are generally not viscous enough to provide a desired thickness to the polyurethane lens.
Additionally, solvent based polyurethanes, when applied as top coats, do not permit the complete evaporation of the solvent from the polyurethane.
The incomplete evaporation can produce striations, parting lines, or bubbles in the polyurethane and therefore result in an aesthetically unacceptable top coat.
However, they tend to degrade and yellow when exposed to sunlight.
Thus, existing polyurethane compositions, and methods for producing them, often result in undesirable finished properties or are unsuitable for exterior applications.

Method used

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  • Flexible polyurethane material
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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0058]The first component, which was polyester polyols / diols based, was prepared by mixing 31.9 grams of Formrez-55-225, 30 grams of Formrez-55-112, and 30 grams of Tone-301 in a round bottom flask and heated to 70° C. The admixture was agitated and de-gassed for 4 hours by vacuum (below about 30 inch Hg) until all the bubbles were stripped off. The temperature of the admixture was cooled down to about 50° C. and 0.06 grams of T-12, 0.2 grams Silwet L-7607, 1.5 grams of Uvinul N-539 and 1 gram of Tinuvin-292 were then added into the admixture. The admixture was agitated for 15 minutes. The formulation of the first reaction component, by weight percent, is listed in Table 2.

[0059]The second reaction component included 100 grams of polyisocyanate (Desmodur XP-7100). The first and second reaction components were mixed in a one to one volume ratio and poured on the above noted eleven substrates. The polyurethanes were cured 10 hours at 52° C. in a convection oven. The cured polyurethane...

examples 2-6

[0063]The first components used in Examples 2-6 were prepared according to the same procedure described in Example 1. The composition of the first component for each Example is listed in Table 1.

[0064]The second component used in Examples 2 was prepared by reacting 30 grams of Pluracol-538, and 70 grams of Vestanat IPDI for 4 hours at 80° C. The resulting second component included a mixture of polyisocyanate with primary and secondary isocyanate groups and monomeric Vestanat IPDI. The second component used in Example 3 was the same as the one utilized in Comparative Example 1. The second component in Example 3 comprises a mixture of secondary polyisocyanate and monomeric Desmodur W. The second component used in Example 4 was prepared by mixing 70 grams of polyisocyanate and 30 of Desmodur H. The second component used in Example 5 was prepared by mixing 50 grams of polyisocyanate and 50 g Desmodur H.

[0065]The polyurethanes were prepared by mixing the first component and the second co...

examples 13-18

[0068]The first components utilized in Examples 13-17 were prepared according to the same procedure described in Example 1. The ingredients were varied in order to demonstrate the effect of varying polyether contents on the cured polyurethane. The ingredients and amounts utilized are summarized in Table 5. Additionally, Example 18 included a black pigment added to the first reaction component.

[0069]The second component in Example 16 was the same as the one used in Comparative Example 2. The second component in Example 17 was the same one utilized in Comparative Example 1. Examples 13 through 15 and 18 utilized a polyisocyanate. The amount of the second component used in each Example is listed in Table 5.

[0070]The polyurethanes for Examples 13-17 were prepared by mixing the first and second components in a one to one volume ratio and then poured onto substrates (1) through (11). The polyurethanes were cured for 10 hours at 52° C. The black pigmented polyurethane in Example 18 was onl...

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Abstract

The present invention provides a flexible two component polyurethane and method for producing the polyurethane. The cured polyurethane is flexible, durable and weather resistant. The polyurethane is suitable for use as a protective layer on various substrates. The flexible polyurethane is the reaction product of solvent-free reaction components. The first component includes one or more polyols, optionally, one or more diols, and a catalyst. The second component includes a primary aliphatic isocyante crosslinker.

Description

[0001]This is a divisional of application Ser. No. 09 / 064,490, filed Apr. 22, 1998 which is now U.S. Pat. No. 6,258,918.FIELD OF THE INVENTION[0002]This invention relates to a flexible, polyurethane material, more particularly, to a solvent free, two-component polyurethane and, even more particularly, to such a polyurethane which is transparent and exhibits improved flexibility, durability and weathering characteristics. The present invention also includes an article utilizing the polyurethane as a top coat, and a method of making such a polyurethane top coat.BACKGROUND OF THE INVENTION[0003]Decorative articles often utilize a polyurethane top coat to cover or protect a base substrate and any indicia or decorative features located on the substrate. The articles may include various substrates upon which printing or profiled graphics have been applied. The polyurethane material is generally clear or optically transparent and functions as a lens in order to display the substrate or any...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B32B7/12C08G18/42B65D83/00B05C17/005C08G18/00C09D175/06B05C17/015B32B27/40B29C41/22C08G18/40C09D175/04
CPCB32B7/12C08G18/4202C09D175/06Y10T428/31551C09D175/04C08G18/32B32B27/40B05C17/00553B05C17/015B65D83/0055
Inventor HO, CHARLIE CHIA-TIEFULLBRIGHT, JR., CLARENCE
Owner 3M INNOVATIVE PROPERTIES CO
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