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Composition of polyester hot-melt adhesive in low melting viscosity

A polyester hot-melt adhesive, low melt viscosity technology, applied in the direction of adhesives, etc., can solve the problems of high apparent viscosity, difficulty in rapid and uniform coating, and increased coating amount

Inactive Publication Date: 2006-04-19
SHANGHAI LIGHT IND RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, because the apparent viscosity of this polyester hot melt adhesive product is generally high, it is difficult to perform fast and uniform coating, which affects the coating speed and increases the coating amount.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Add 194 grams of dimethyl terephthalate, 236 grams of 1,6-hexanediol, and 124 grams of ethylene glycol in a 1000 milliliter stainless steel reaction kettle equipped with a thermometer, a mechanical stirrer, a Vigre fractionating column and a condenser and 0.23 g of n-ethyl phthalate. Heat up the temperature, and when the temperature in the kettle reaches 100°C, start stirring immediately. When the temperature rises to about 145°C, methanol droplets begin to distill, and the distillation temperature is 60-80°C, and the temperature continues to rise until the temperature in the kettle reaches about 200°C. When the amount of methanol distilled is greater than 97% of the theoretical amount, the transesterification is completed and the stop Heat and cool.

[0042]When the temperature in the above reaction kettle drops below 100°C, add 100 grams of isophthalic acid, 81 grams of sebacic acid, and add 0.2 grams of triphenyl phosphite and 4 grams of medical talcum powder, and t...

Embodiment 2-10

[0045] Proceed by the same steps and conditions as in Example 1, except that the raw materials used and their proportioning ratio are shown in Table 1 below. The analytical results of the obtained product are also listed in Table 1.

Embodiment 11

[0047] Add 5 kilograms (32 moles) of 3,5-dihydroxybenzoic acid and 0.57 kilograms (4 moles) of 3,5-dihydroxytoluene into a 100 liter reactor, add 4 grams of 98% concentrated sulfuric acid as a catalyst and 40 liters of cyclohexane Alkane is used as a solvent, slowly heated to 90°C while stirring, cooled and distilled off cyclohexane and its azeotrope water until the reaction is complete to form a yellow solid. Add tetrahydrofuran and water to wash, filter, and dry under vacuum at constant temperature to remove the solvent to obtain yellow microcrystals.

[0048] The weight average molecular weight measured by GPC analysis method is 2000-3000.

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Abstract

A thermofusible polyester adhesive with low viscosity in fused state contains proportionally the polyester diol prepared by polycondensation reaction between binary carboxylic acid and C2-6 diol, and the superbranced polyester prepared by copolymerization reaction between 3,5-dihydroxytoluene and 3,5-dihydroxybenzoic acid.

Description

technical field [0001] The invention relates to a polyester hot-melt adhesive composition, especially a polyester hot-melt adhesive composition with low melting viscosity. Background technique [0002] Currently known polyester hot melt adhesives all use aromatic dibasic acids (or dimethyl dibasic acid) such as terephthalic acid and long carbon chain aliphatic dibasic acid (or dimethyl dibasic acid), dibasic acid dimethyl Alcohols are obtained after esterification (or transesterification) and polycondensation. For example, US Pat. No. 6,255,443 discloses a low melting point copolyester and polyether ester hot melt adhesive. [0003] However, because the apparent viscosity of such polyester hot melt adhesive products is generally high, it is difficult to perform fast and uniform coating, thereby affecting the coating speed and increasing the coating amount. Contents of the invention [0004] The object of the present invention is to provide a polyester hot-melt adhesive c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J167/02
Inventor 顾庆锋蔡真
Owner SHANGHAI LIGHT IND RES INST
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