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Hardener composition for epoxy resins

Inactive Publication Date: 2005-06-30
VALETTE LUDOVIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014] When the hardener composition of the present invention is used in an epoxy resin / hardener system, several advantages are obtained including for example, (i) an epoxy resin composition that will not have phase separation between the epoxy component and the additive components in the resin composition; (ii) an epoxy / hardener varnish which is a clear solution or a stable dispersion depending on the solvent used when an appropriate ratio of components (a), (b), and (c) is used; (iii) a partly cured B-staged prepreg that has improved prepreg properties including for example, an improved surface appearance and generates less dust during handling compared to standard SMA epoxy systems; (iv) a fully cured C-staged laminate that exhibits improved laminate properties including for example, improved toughness and less tendency to delaminate compared to standard SMA / epoxy systems or compared to epoxy resin systems with standard toughening agents; (v) a laminate having improved dielectric properties; and (vi) a laminate with enhanced thermal properties including for example, a high glass transition temperature and a high thermal resistance.

Problems solved by technology

The main drawback of this known SMA hardener system is that it provides laminates with high brittleness.
The known SMA hardener system also has poor processability because a prepreg powder made with the known SMA hardener is easy to remove from a substitute such as a glass web, creating a lot of dust when the prepreg is handled (a so-called “mushroom” effect).
In addition, the resulting laminate made from the known SMA hardener system has a low toughness and is easy to delaminate, creating defects during drilling operations of the laminates.
Often, the resulting prepreg also shows poor prepreg cosmetics due to entrapped gas bubbles.

Method used

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  • Hardener composition for epoxy resins
  • Hardener composition for epoxy resins

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0099] In this example, an anhydride hardener solution of the present invention was prepared in a 5L glass reactor, equipped with a mechanical stirrer, a heating jacket, a N2 inlet and a dropping funnel. 1821.3 g of Dowanol* PMA and 40.3 g of SBM 1A17 were charged in the reactor and heated to 90° C. After the solids were completely dissolved, 1554.8 g of SMA 3000 was added to the solution. After the solids were completely dissolved, 201.3 g of Ricon* 131MA10 was added to the solution. Then the solution turned into a white turbid solution but was homogeneous. After 30 minutes, the solution was allowed to cool down to a temperature of 80° C. and MEK was introduced into the solution at 80° C. After complete cooling of the solution to ambient temperature (−25° C.), the anhydride hardener solution was turbid whitish homogeneous. The hardener solution remained stable during a testing period of 2 months without phase separation nor settling. The theoretical anhydride equivalent weight of t...

example 2

[0101] An anhydride hardener solution was prepared using the same procedure as described in Example 1. The anhydride hardener composition included 1821.3 g of cyclohexanone, 1510.0 g of SMA 3000, 238.7 g of Ricon* 130MA13, 47.7 g of SBM 1A17 and 364.3 g of MEK. The resulting anhydride hardener solution was turbid whitish homogeneous. The hardener solution remained stable during a testing period of 2 months without phase separation nor settling. The theoretical anhydride equivalent weight of the hardener solution was 431 (based on solids).

EXAMLE 3

[0102] An anhydride hardener solution was prepared using the same procedure as described in Example 1. The anhydride hardener composition included 1821.3 g of cyclohexanone, 1490.6 g of SMA 3000, 254.9 g of Ricon* 131MA10, 51.0 g of SBM 1A17 and 364.3 g of MEK. The anhydride hardener solution was turbid whitish homogeneous. The hardener solution remained stable during a testing period of 2 months without phase separation nor settling. The ...

example 4

[0103] An anhydride hardener solution was prepared using the same procedure as described in Example 1. The anhydride hardener composition included 1216.3 g of Dowanol* PMA, 1216.3 g of SMA 3000, 168.7 g of Ricon* 131MA10, 29.2 g of SBM 1A17 and 285.5 g of MEK. The anhydride hardener solution was turbid whitish homogeneous. The hardener solution remained stable during a testing period of 2 months without phase separation nor settling. The theoretical anhydride equivalent weight of the hardener solution was 433 (based on solids).

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Abstract

A hardener composition useful for curing epoxy resins including a blend of (a) a carboxylic anhydride which is a copolymer of an ethylenically unsaturated anhydride and a vinyl compound; (b) a copolymer of an ethylenically unsaturated anhydride and an elastomer; and optionally (c) a stabilizing agent such as a block copolymer to prevent phase separation of components (a) and (b). The hardener composition is particularly useful in electrical laminates applications.

Description

FIELD OF THE INVENTION [0001] The present invention relates to compositions useful as crosslinkers for curing epoxy resins. More particularly, the present invention relates to a hardener composition useful as a crosslinker for curing epoxy resins. The epoxy resins, in turn, are used for example, in electrical laminates applications. BACKGROUND OF THE INVENTION [0002] It is known to make electrical laminates and other composites from a fibrous reinforcement and an epoxy-containing matrix resin. Examples of suitable processes usually contain the following steps: [0003] (1) An epoxy-containing formulation is applied to or impregnated into a substrate by rolling, dipping, spraying, other known techniques and / or combinations thereof. The substrate is typically a woven or nonwoven fiber mat containing, for instance, glass fibers or paper. [0004] (2) The impregnated substrate is “B-staged” by heating at a temperature sufficient to draw off solvent in the epoxy-containing formulation and op...

Claims

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Application Information

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IPC IPC(8): B32B27/04C08L63/00H05K1/03
CPCB32B27/04C08G59/42C08L63/00C08L2205/03H05K1/0326C08L2666/04Y10T428/31511C08L23/18C08J5/24B32B15/092C08L2203/20B32B15/20B32B15/14B32B2038/0076B32B2260/021B32B2260/046B32B2305/076B32B2305/72B32B2457/08
Inventor VALETTE, LUDOVIC
Owner VALETTE LUDOVIC
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