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Polyurethane hot melt adhesives with acrylic copolymers and thermoplastic resins

An acrylate terpolymer, hot melt technology, used in polyurea/polyurethane adhesives, monocarboxylate copolymer adhesives, ester copolymer adhesives, etc.

Inactive Publication Date: 2003-08-20
NAT STARCH & CHEM INVESTMENT HLDG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Although a number of methods for the preparation of adhesive compositions are described in the above published patents, none of the methods in the above disclosed patents are able to prepare adhesive compositions completely satisfactorily
None of the above disclosed patents can produce a low cost, reactive hot melt with improved thermal and tensile properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] A 500 ml reaction vessel with addition port, vacuum port, thermometer, stirrer and heating mantle. The reaction component contains the following substances:

[0101] 1. Polypropylene glycol, 2000MW 81

[0102] 2. MMA / BMA / HEMA / MAA (acrylic) 35

[0103] 3. Glyceryl Rosin Ester, 105R&B SP 85

[0104] 4. EVA, MI2500, 28% VA 60

[0105] 5. Ethylene terpolymer, MI500 23

[0106] 6. Methylene bisphenyl diisocyanate 40

[0107] 7. Catalyst 1

[0108] The reaction vessel was charged with combinations 1, 2 and 3 and the temperature was raised to 250°F. Stir when mixture melts and until smooth. Components 4 and 5 are then added and the vacuum is brought to 0 inches Hg. Maintain vacuum, stir and heat for 2 hours. Component 6 was added and held at this temperature for an additional 3 hours; vacuum was reapplied for 1 hour after addition. Component 7 was then added and vacuum, stirring and temperature maintained for an additional hour. The properties of the product are as ...

Embodiment 2

[0117] The procedure of Example 1 was repeated except replacing half of the glyceryl rosin ester with 103 R&B SP Aliphatic-Aromatic Tackifying Resin. The viscosity at 250°F decreased to 5750 cp and the percentage of isocyanate groups increased to 2.3%; uncured creep resistance changed to 31°C.

[0118] 1. Polypropylene glycol, 2000MW 81

[0119] 2. MMA / BMA / HEMA / MAA (acrylic) 35

[0120] 3. Glyceryl Rosin Ester, 109R&B SP 42.5

[0121] 4. Hydrogenated C5-C9, 103R&B SP 42.5

[0122] 5. EVA, MI2500, 28% VA 60

[0123] 6. Ethylene terpolymer, MI 500 23

[0124] 7. Methylene bisphenyl diisocyanate 40

[0125] 8. Catalyst 1

[0126] The performance of the product is as follows:

[0127] performance:

[0128] Percentage of vinyl polymer 13%

[0129] Prepolymer percentage 55

[0130] Percent isocyanate 2.3

[0131] Viscosity at 250°F (cp) 5750

[0132] Uncured heat resistance 31℃

[0133] Curing heat resistance 160℃

Embodiment 3

[0135] In this embodiment, the reaction components include the following materials:

[0136] 1. MMA / BA / HEMA 175

[0137] 2. Glyceryl Rosin Ester, 109R&B SP 53

[0138] 3. EnBA, MI900, 35% nBA 53

[0139] 4. Isophorone diisocyanate 19

[0140] 5. Catalyst 2

[0141] Components 1, 2 and 3 were added to the reaction vessel and the temperature was raised to 250°F. Stir when mixture melts and until smooth. The vacuum was brought to 0 inches Hg and held for 2 hours, then component 4 was added and held at temperature for an additional 3 hours; vacuum was reapplied for 1 hour after addition. Component 5, a curing catalyst composition, was then added and vacuum, agitation and temperature maintained for an additional hour.

[0142] performance:

[0143] Percentage of vinyl polymer 17.5%

[0144] Prepolymer % 64

[0145] Percent isocyanate 2.1

[0146] Viscosity (cp) at 250°F 8875

[0147] Uncured heat resistance 39℃

[0148] Curing heat resistance 160℃

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Abstract

This invention relates to solvent-free moisture curable one-part hot melt polyurethane adhesive or sealant compositions which are solid at room temperature. In one embodiment, the polyurethane adhesive or sealant composition comprises in percentages by weight (a) from about 20 % to about 75 % of a urethane prepolymer; (b) from about 1 % to about 66 % of a reactive, hydroxyl containing, or a nonreactive polymer formed from ethylenically unsaturated monomers; and (c) from about 20 % to about 75 % of a thermoplastic resin. In another embodiment, the polyurethane adhesive or sealant composition comprises, in percentages by weight of the polyurethane composition (a) from about 10 % to about 90 % of a urethane prepolymer; and (b) from about 5 % to about 90 % of a thermoplastic resin which is an ethylene vinylacetate / ethylene acrylate terpolymer.

Description

field of invention [0001] The present invention relates to solvent-free moisture-curable one-component hot melt polyurethane adhesives or sealing compositions that are solid at room temperature. In one embodiment, the polyurethane adhesive or sealant composition comprises, by weight percent, (a) about 20% to 75% polyurethane prepolymer; (b) about 1% to 66% ethylenically unsaturated and (c) from about 20% to about 75% of a thermoplastic resin. In another embodiment, the polyurethane adhesive or sealing composition comprises, by weight percentage of the polyurethane composition, (a) about 10%-90% of polyurethane prepolymer; and (b) about 5%-90% of A thermoplastic resin which is an ethylene-vinyl acetate / ethylene-acrylate terpolymer. technical background [0002] Hot melt adhesives are 100% solid substances that do not contain or require any solvents and are solid at room temperature. By heating, the hot melt adhesive melts into a liquid or fluid sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/10C08G18/12C08G18/36C08G18/40C08G18/62C09J123/08C09J131/04C09J133/08C09J175/04C09J175/06C09J175/08C09K3/10
CPCC09K3/1021C08G18/4063C09J175/04C08G2170/20C08G18/12C08G18/36C08L2666/04C08G18/307
Inventor W·K·楚
Owner NAT STARCH & CHEM INVESTMENT HLDG CORP
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