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Process for combating the appearance of haze during the coating of flexible supports with a crosslinkable liquid silicone composition, in a roll device

A technology of silicone coating and cloth flexibility, which is applied in the field of preventing fogging when coating a flexible carrier with a crosslinkable liquid silicone composition in a roll device, and can solve problems such as not providing quantitative factors for evaluation

Active Publication Date: 2011-09-14
BLUESTAR SILICONES FRANCE SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0024] Regarding the last point, the patent US 6 057 033 does not provide any quantitative factors for evaluating the reduction of fogging brought about by cellulose fibers

Method used

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  • Process for combating the appearance of haze during the coating of flexible supports with a crosslinkable liquid silicone composition, in a roll device
  • Process for combating the appearance of haze during the coating of flexible supports with a crosslinkable liquid silicone composition, in a roll device
  • Process for combating the appearance of haze during the coating of flexible supports with a crosslinkable liquid silicone composition, in a roll device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0208] Example 1 - Preparation of anti-fogging additive E1 according to the invention

[0209] In a 1L three-neck flask equipped with an anchor stirrer and a nitrogen flow inlet and outlet, add 150 g of polydimethylsiloxane (viscosity at 25 ° C is 1000 cP) with a trimethylsilyl end group, 72 g of polydimethylsiloxane (viscosity 14000 cP at 25° C.) containing hydroxyl functional end groups and 7.2 g of a partially hydrolyzed condensate of ethyl silicate (commonly known as partially hydrolyzed polyethyl silicate). The mixture was stirred and 0.9 g of basic catalyst (solution of potassium silanolate in octamethylcyclotetrasiloxane, KOH equivalent content 14% by weight) were added. The mixture was heated to 130°C. Keep stirring and heating. Then add 5g of silicon dioxide (Nippon Aerogel company's The specific surface area is 200m 2 / g) and 4.7 g of polydimethylsiloxane with hydroxyl end groups (viscosity 50 cP at 25° C.) and homogeneously disperse them with the aid of a homom...

Embodiment 2

[0210] Example 2: Preparation of anti-fogging additive E2 according to the invention

[0211] The anti-fogging additive was prepared in two steps. Step 1 can obtain ultra-high molecular weight resin.

[0212] step 1:

[0213] The molecular weight (Mw) is equal to 12,900, and the general formula is SiO 1.3 (OH) 1.28 Me 0.12 The solid MQ resin (A), the general formula is HO(Me 2 SiO) 15 H's linear polydimethylsiloxane (B) with ≡SiOH end groups and xylene were reacted in a three-necked flask equipped with an apparatus commonly referred to as Dean-Stark and a condenser to prepare an ultrahigh molecular weight MQ resin. The molecular weight (Mw) of compound (A) was 12,900. Compound (B) is preferably a linear polydimethylsiloxane with ≡SiOH end groups having the formula HO(Me 2 SiO) 15 H. The weight ratio of (A) / (B) is 15.7 / 1. The reaction mixture was heated at reflux (140°C) while maintaining constant agitation for 24 hours during which time ammonia catalyst was continuo...

Embodiment 3

[0216] Example 3: Preparation of anti-fogging additive E3 according to the invention

[0217] In a 1L three-necked bottle equipped with a stirrer and a nitrogen purging system, add 280 g of polydimethylsiloxane with a trimethylsilyl end group with a viscosity of 100 mPa·s at 25 ° C, 505 g of polydimethylsiloxane at 25 Polydimethylsiloxane with hydroxyl end groups having a viscosity of 14000 mPa·s at °C and 165 g of a hybrid polysiloxane containing approximately 31% of MQ resin with an OH content of 0.7% by weight . The mixture was stirred and then 30.7 g of basic catalyst (a solution of potassium silanolate in octamethylcyclotetrasiloxane, KOH equivalent content 14% by weight) were added. Stirring was maintained for 45 minutes, then 38.4 g of silicon dioxide ( Precipitated silica provided by Rhodia Company) and uniformly dispersed by means of a homomixer. The mixture was then quenched by heating at 160°C for 1 hour and then cooled to ambient temperature. A viscous product...

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Abstract

The invention relates to the general field of silicone coating, on high-speed rolls, of various flexible supports such as sheets of paper or of synthetic polymer (polyolefin, polyester, etc.), or else of textile. The invention relates to an effective process for combating the appearance of haze during the coating of flexible supports with a liquid silicone composition that is a precursor of crosslinked coatings, this coating taking place using a roll coating device that operates at high speed.

Description

technical field [0001] The present invention relates to the general field of silicone coating of various flexible supports, such as paper or synthetic polymers (polyolefins, polyesters, etc.) or fabrics, on high speed rolls. [0002] More specifically, the present invention relates to coating flexible materials with liquid compositions containing one or more polyorganosiloxanes crosslinkable by polyaddition, dehydrocondensation, polycondensation, cationic or free radical routes to form Protective films or coatings with special anti-adhesive and / or hydrophobic properties. Background technique [0003] The flexible carrier can be paper, cardboard, plastic film or metal film. Applications of such silicone-coated supports are eg food papers (pastry molds, packaging), labels / adhesive tapes, joints, etc. [0004] The coating of these flexible supports with crosslinkable liquid silicones takes place in continuously operating very high-speed coating devices. This device comprises...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D7/12C09D183/04B05D5/08C09D7/65
CPCC09D7/125B05D5/08C09D183/04B05D2252/02C09D7/65C08L83/00C09D5/00B05D5/00
Inventor N·马丁T·伊雷朗德J-M·弗朗斯M·德吕埃勒亚斯恩·马达迪
Owner BLUESTAR SILICONES FRANCE SAS
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