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Pressure sensitive adhesives and methods for their preparation

A pressure-sensitive adhesive and composition technology, applied in the direction of adhesive, film/sheet adhesive, pressure-sensitive film/sheet, etc., can solve the problem of long curing time of sealant

Inactive Publication Date: 2008-07-16
DOW CORNING CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages of this system can be e.g. the long time required to cure the sealant before the prefabricated unit can be moved, the system has a high mullion width due to the spacers, too gentle heat resistance and too gentle barrier to external sound

Method used

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  • Pressure sensitive adhesives and methods for their preparation
  • Pressure sensitive adhesives and methods for their preparation
  • Pressure sensitive adhesives and methods for their preparation

Examples

Experimental program
Comparison scheme
Effect test

reference example 1-180

Reference example 1-180 degree peel adhesion test

[0062] This test method is based on ASTM C 794 Standard Test Method for Adhesion-in-Peel of Elastomeric Joint Sealants on Primed Stainless Steel Mesh Substrates 1 / 2" in width. The substrate is prepared by cleaning with isopropanol. PSAC Apply to a closed cell silicone foam extrudate and secure to a substrate using specified pressure and dwell time, and laminate the substrate to the extrudate.The resulting peel bonded sample is then placed in a mechanical testing machine. Clamp the peel-bonded sample in place with pliers and pull at an angle of 180° at 2 inches / minute. Pull the sample for a total of 1 inch. Record the force per inch of width (pounds per line inch, pli ) and cohesive failure %.

Reference Example 2 - Tab Bonding

[0063] Prepare the substrate by cleaning with isopropanol. The PSAC is applied to the foam carrier and fixed to the substrate using the specified pressure and dwell time. Pull the sample by hand at...

Embodiment 1

[0077] PSAC samples were prepared by mixing the components at the percentages shown in Table 1. Also shown in Table 1 are the (B) / (A) ratio and the resin / polymer ratio. Each PSAC sample was applied to both sides of a carrier measuring 1 / 4" x 11 / 16" x 2", the solvent was removed, and the resulting tape was sandwiched between glass plates at 2 psi for 45 minutes. Tab adhesion was evaluated after 4 hours and after 7 days with reference to the method of Example 2. The results are shown in Table 1.

Table 1

components

[0078] Comparative Sample 2 shows that when the treated resin is omitted from the PSAC, the resulting PSAP may have insufficient adhesion for structural applications. Comparative Sample 4 further shows that when the resin / polymer ratio in the PSAC is too low, the resulting PSAP may have insufficient adhesion for structural applications. Samples 1 and 3 show that when the (B) / (A) ratio and the resin / polymer ratio are properly chosen, the resulting PSAP ...

Embodiment 2

[0079] PSAC samples were prepared by mixing the components at the percentages shown in Table 2. Also shown in Table 2 are the (B) / (A) ratio and the resin / polymer ratio. Each PSAC sample was applied to both sides of a carrier measuring 1 / 4" x 11 / 16" x 2", the solvent was removed, and the resulting tape was sandwiched between glass plates. Each PSAC was again applied to the sides of the carrier. on both sides, and the resulting tape was sandwiched between a glass plate and the surface of DURANAR(R). DURANAR(R) is a fluororesin-based paint commercially available from PPG Industries, Inc., of Pittsburgh, Pennsylvania, U.S.A. By Reference Example 3 The method, after 7 days, evaluates tensile adhesion.The results are shown in Table 2.

Table 2

components

[0080] Example 2 shows that relatively high resin / polymer ratios can be advantageously used for some PSAC formulations when relatively high levels of treated MQ resin are used in combination with low levels of fusing ...

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Abstract

A pressure sensitive adhesive composition includes (A) a bodied MQ resin containing (i) a resinous core and (ii) a nonresinous polyorganosiloxane group, where the nonresinous polyorganosiloxane group is terminated with a silicon-bonded hydroxyl group; (B) a treated MQ resin, where (B) / (A) ratio has a value of 0.3 to 5.0, and (C) a polydiorganosiloxane terminated with a condensation reactable group; where resin / polymer ratio has a value of 2.0 to 3.0; optionally (D) a crosslinker; optionally (E) a catalyst; and optionally (F) a solvent. A pressure sensitive adhesive product prepared by curing the pressure sensitive adhesive composition is useful in structural attachment applications such as structural glazing applications.

Description

[0001] cross reference [0001] Pursuant to 35 U.S.C. §119(e), this application claims the benefit of U.S. Provisional Patent Application No. 60 / 701766, filed July 17, 2005, which is hereby incorporated by reference. technical field [0002] The present invention relates to pressure sensitive adhesive compositions which are especially useful in structural fastening applications. More particularly, the present invention relates to condensation reaction curable pressure sensitive adhesive compositions that cure under ambient conditions and are useful in structural glazing applications. Background of the invention [0003] Curable pressure sensitive adhesive compositions capable of curing at room temperature are known in the art and are commercially available. These pressure sensitive adhesive compositions are useful in a variety of nanostructure immobilization applications. However, a disadvantage of these pressure-sensitive adhesive compositions is that they may lack suffic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J183/04C08L83/04C09J7/02C09J7/22C09J7/38
CPCC09J2483/00C09J2483/006C09J7/0246C08L83/04C09J7/0207C09J183/04C08L83/00C09J7/38C09J7/22Y10T428/2852C09J2301/50
Inventor A·博格L·劳尔T·路易德R·奈斯比特R·施密特
Owner DOW CORNING CORP
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