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Polyacrylic moisture curable copolymer

A polyacrylic and acrylic technology, applied in the field of polymers, can solve problems such as expensive manufacturing

Inactive Publication Date: 2010-10-06
ILLINOIS TOOL WORKS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moisture-curable acrylic sealants have been made by adding silane-terminated acrylic polymers to make materials for backing windows, but such sealants have limited strength and elasticity and are expensive to manufacture

Method used

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  • Polyacrylic moisture curable copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 - Synthesis of Functionalized Moisture Curable Prepolymer

[0029] 175g butyl acrylate (Tg-55°C), 110g methyl acrylate (Tg 8°C), 13g lauryl methacrylate (Tg-65°C), 3g methyl methacrylate (Tg 105°C) and 1g hydroxyethyl acrylate The ester (Tg - 15°C) was added to the mixing tank along with 1.5 g dodecanethiol and 0.3 g benzoyl peroxide and mechanically stirred for 1 minute. 100 g of tert-butyl acetate was added to the round bottom flask and refluxed. Over a period of more than 3 hours, the acrylate-based monomer mixture containing peroxide and thiol was added dropwise, and the mixture was heated to above 110° C. with mechanical stirring. Over a period of 15 minutes, an additional 0.3 g of benzoyl peroxide was added to the flask, followed by maintaining the reaction temperature for 1 hour. Then, 0.1 g of benzoyl peroxide was added over a further 5 minutes and the reaction temperature was maintained for an additional 1 hour. After this time, another 30 g of so...

Embodiment 2

[0031] Example 2 - Synthesis of Coating Type Medium Tg Polyacrylic Polymer

[0032] The butyl acrylate and lauryl methacrylate in Example 1 are replaced with corresponding amounts of methyl methacrylate and methyl acrylate respectively, and the method of Example 1 is repeated to obtain 13 mole fractions of acrylic acid monomers. % methyl acrylate and 33% methyl methacrylate, the monomer percentage weighted prepolymer glass transition temperature is 25°C. The obtained prepolymer had an average molecular weight of 36,000 and an average functionality of 3. When moisture cured, polyacrylic acid has a tensile strength of 147 lbs / linear inch and a linear percent elongation of 565%. The obtained polyacrylic resin was harder than the product of Example 1, but still flowable. The high tensile strength and high cohesive strength of the polyacrylic polymer formed from this prepolymer comes at the expense of the loss of adhesion to glass, aluminum substrates relative to the polyacryl...

Embodiment 3

[0033] Example 3 - Inventive polyacrylate system with high glass transition temperature

[0034] Adopt the methacrylate (methyl methacrylate) that accounts for 11 mole percent of existing acrylate monomer and 73 mole percent of acrylic acid monomer, reduce remaining acrylate polymer appropriately simultaneously, repeat embodiment 1 Methods. The resulting prepolymer had a weighted monomer percent glass transition temperature of 50°C. The isocyanate groups form crosslinked polymers upon moisture curing, producing polymers which are less tacky than the polymer prepared according to Example 2, but which are significantly tougher and harder.

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Abstract

A polyacrylic polymer is provided that is formed by moisture cure of multiple acrylic prepolymer segments. The prepolymer segments each have an average molecular weight of between 5000 and 400.000 grams per mole. Each of the prepolymers is a homopolymer or copolymer of a monomer from among methyl methacrylate, C1-C16alkyl acrylate, and C1-C16 alkyl methyl methacrylate as the predominant manomeric group. The prepolymers are interconnected through moisture cure induced urea, urethane, or combinations thereof. The polymer is readily cured upon exposure to atmospheric moisture absent inclusion or evolution of a volatile organic compound. The polymer is likewise formed HAP free. Through control of prepolymer properties a variety of thermoset polymer properties are obtained. A prepolymer is formed including a minority amount of functionalized acrylic monomer that is isocyanate or converted to isocyanate through subsequent reaction. Functionalized acrylic monomers operative herein include a hydroxyl, a primary amine, a secondary amine, a sulfonic acid, or an epoxy. Upon application from storage in an anhydrous state, the prepolymer cures upon exposure to atmospheric moisture.

Description

[0001] cross application [0002] This application claims priority to US Patent Application Serial No. 60 / 979,115, filed October 11, 2007, which application is incorporated herein by reference. technical field [0003] This invention relates generally to polymers which are curable when exposed to atmospheric moisture and which are rubbery elastic, and in particular to such polymers containing an acrylic component. Background technique [0004] Controlling polymer properties is a complex series of material tradeoffs. Invariably, when a given polymer fails to exhibit the desired characteristics, molecular weight, degree of branching, copolymer block, etc. are modified in an attempt to obtain the desired properties. If these efforts fail, a new base monomer is selected and the process repeated. [0005] Polyurethane polymers are moisture curable and offer many advantages such as attractive adhesion and rubber elasticity, recycling, adhesion to concrete, and negligible shrinka...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/10C08G18/62C09D175/04
CPCC08G2190/00C08G18/6229C08G18/10C09D175/04C08G18/307C08G18/70C08F20/18
Inventor 泰·丹尼斯·哈维宇铎·朱
Owner ILLINOIS TOOL WORKS INC
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