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Silante terminated polyurethane

A silane-terminated, polyurethane technology, applied in the field of alkoxysilane-functional urethane compositions, can solve the problems of foaming, inability to provide sufficient tensile strength and/or elongation at break, and easy film cracking.

Inactive Publication Date: 2009-05-06
BAYER MATERIALSCIENCE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, hitherto known adhesives, sealants and coating compositions do not provide sufficient tensile strength and / or elongation at break properties, either initially, or especially after exposure to elements, to protect the substrates to which they are applied
As a result, cured films from such adhesive, sealant and coating compositions are prone to cracking, blistering and / or crumbling, exposing the underlying substrate

Method used

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  • Silante terminated polyurethane
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  • Silante terminated polyurethane

Examples

Experimental program
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Effect test

Embodiment 1

[0131] This example illustrates the preparation of silane-functional aspartic acid esters according to the invention. Aspartate resins were prepared according to US Patent No. 4,364,955 to Kramer et al. Add 1483 grams (8.27 equivalents) of 3-aminopropyltrimethoxysilane to a 5-liter flask equipped with a stirrer, thermocouple, nitrogen inlet, addition funnel, and condenser, then within two hours, add 1423.2 g (8.27 equivalents) of diethyl maleate, and maintained at this temperature for 5 hours. The unsaturation value by iodine titration was 0.6, indicating that the reaction was nearly 99% complete. use Viscometer (Model DV-II+, Brookfield Engineering, Inc., Middleboro, MA, spindle 52) with a viscosity of 11 centipoise measured at 25°C at 100 rpm.

Embodiment 2

[0133] This example describes the preparation of a silane-terminated polyurethane (STP1) according to the invention. In a 5-liter round bottom flask equipped with a stirrer, nitrogen inlet, addition funnel and condenser tube, add 150.9 grams (1.1 equivalents) of isophorone diisocyanate, 3664.1 grams (0.6 equivalents) as described in U.S. Patent No. 4,355,188 The prepared equivalent weight is 6411 polyether monohydric alcohol and 0.6 gram of dibutyltin dilaurate. The reaction was heated at 60° C. for 3 hours, after which time the NCO content was determined by NCO titration to be 0.65% by weight (theoretical = 63%). Then 202.2 g (0.57 equivalents) of the silane-functional aspartic ester of Example 1 were added and the mixture was maintained at 60° C. for 60 minutes, after which time no NCO groups could be detected by IR spectroscopy. At this point, 20 grams of vinyltrimethoxysilane was added as a desiccant. The viscosity at 25°C is 16100 centipoise.

Embodiment 3

[0135] This example describes the preparation of a silane-terminated polyurethane (STP2) according to the invention. To a 5 L round bottom flask equipped with a stirrer, nitrogen inlet, addition funnel and condenser was charged 366.7 g (3.3 eq) of isophorone diisocyanate, 122.7 g (0.165 eq) of n-butanol and 0.2 g of dilauric acid Dibutyltin. The reaction was heated at 60° C. for 3 hours, after which time the NCO content was determined to be 14% by weight by NCO titration (theoretical = 14.2%). Then 605.1 g (1.65 equivalents) of the silane-functional aspartic acid ester of Example 1 were added and the mixture was maintained at 60° C. for 60 minutes, after which time no NCO groups could be detected by IR spectroscopy. At this point, 5.5 grams of vinyltrimethoxysilane was added as a desiccant. The viscosity at 25°C is 242000 centipoise.

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Abstract

A curable alkoxysilane-functional polyetherurethane composition formed by mixing a) with b), wherein: a) is a first silane-terminated polyurethane prepared by: i) a monofunctional compound With ii) an isocyanate component containing two isocyanate groups, the reaction product is reacted with iii) a compound containing one isocyanate-reactive group and one or more reactive silyl groups to form a moisture-curable alkoxysilane-functional polymer ether urethane; b) a second silane-terminated polyurethane prepared by reacting i) an alkyl monofunctional alcohol, amine and / or thiol with ii) an isocyanate component containing two isocyanate groups, the reaction product Reaction with iii) compounds containing one isocyanate-reactive group and more than one reactive silyl group. The polyurethane composition may be used in coating, sealant and / or adhesive compositions. The coating composition is used to form a coated substrate. The sealant and / or adhesive composition is used in a method of joining a first bonded body and a second bonded body to form a bonded assembly.

Description

[0001] Background of the invention field of invention [0002] The present invention relates to alkoxysilane functional urethane compositions, and more to alkoxysilane functional urethane compositions useful in adhesives, sealants and coating compositions. Background technique [0003] Adhesives are commonly used to connect and secure two or more adherends. A bond is considered any two or more materials or parts of materials joined together, including wood, metal, plastic, paper, ceramic, stone, glass, concrete, etc. Adhesives for these applications are based on various technologies including elastomer / solvent / resin blends, epoxies, latexes, polyurethanes, (poly)siloxanes, cyanoacrylates, acrylics, hot melts, etc. Such adhesives have one or more disadvantages, for example they contain toxic and often flammable solvents, they may be incompatible with one or more types of bond, they have unfavorably long curing times, and in many In some cases, the bonds they form are not s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/28C08G18/80C09J175/04C09K3/10B32B27/00C08G18/38C08K3/00C08L75/04C09J5/06
CPCC08L75/04C08G2190/00C09J5/06C08G18/3893C08G18/8064C08G18/809C08G18/283C09J2475/00Y10T428/31551Y10T428/31591C08G18/28C08G18/80C09J175/04C09K3/10
Inventor R·R·罗斯勒D·L·克劳弗德
Owner BAYER MATERIALSCIENCE AG
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