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Hot melt adhesive composition

A composition and tackifier technology, applied in the field of hot melt adhesive compositions, can solve the problems of poor adhesion, high softening point, poor cohesion, etc., and achieve good penetration and adhesion, excellent Bond strength, effect of strong mechanical connection

Inactive Publication Date: 2011-07-20
PROCTER & GAMBLE CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In more critical and demanding applications where plastic films, usually polyolefin films, must be glued together and / or must be glued to other plastic or nonwoven materials made from polyolefin fibers, for example in hygiene articles such as Unsatisfactory use of current adhesive formulations based on ethylene-vinyl acetate copolymers in the construction of baby and adult diapers, panty liners, etc.
In these applications, conventional formulations of hot melt adhesives based on ethylene-vinyl acetate copolymers exhibit poor cohesion and poor elongation at break for plastics, especially for most hydrophobic plastics Poor adhesion to polyolefins, and poor permeability and adhesion to plastic porous substrates such as nonwovens
[0006] Because of these serious drawbacks, hygienic articles have hitherto required the use of hot melt adhesives based on styrenic block copolymers, despite their higher cost, more difficult handling, higher softening points and other troublesome properties
Thus, current styrenic block copolymer formulations have inherent drawbacks that are compounded by rising raw material costs, processing and shipping these adhesives

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Example 1: Adhesive Composition and Properties

[0057] Material :

[0058] The following raw materials (bw=by weight) are mixed according to the invention:

[0059]

[0060] Escorene UL 15019 CC is an ethylene-vinyl acetate copolymer from Exxon Mobil characterized by a vinyl acetate content of 19% by weight and a melt viscosity of 262 Pascals at 150°C.

[0061] Escorene MV 2528 EH2 is an ethylene vinyl acetate copolymer from Exxon Mobil characterized by a vinyl acetate content of 28% by weight and a melt viscosity of 9.6 Pascal at 150°C.

[0062] Sylvalite RE100 L is a rosin ester tackifier available from Arizona Co. characterized by a softening point of 100°C.

[0063] Nytex 820 is a plasticized naphthenic mineral oil available from Nynas Co.

[0064] Vestowax H2050 is a synthetic Fischer-Tropsch wax from Evonik Degussa with a dropping point of about 117°C.

[0065] The above ingredients are mixed in a molten state by methods well known in the art to obtain...

Embodiment 2

[0074] Embodiment 2: comparative embodiment

[0075] The same ingredients used in Example 1 were mixed according to formulation standards similar to those suggested by the prior art. The steps for preparing the composition are the same as those described above. Specifically, use a larger amount of wax according to the following recipe:

[0076]

[0077] The formulation exhibits the following properties:

[0078] Viscosity at 120°C = 2800 mPa / s

[0079] Elongation at break = 30%

[0080] Break energy = 53 mJ

[0081] Creep time = 40 seconds

[0082] Eta(90)-Eta(130) / (130-90)=9.39

[0083] Film-to-film T-peel force = 14g / inch

[0084] T-peel force of film to nonwoven = 34g / inch

[0085] Those skilled in the art of making hygiene articles will recognize that the above properties are unsatisfactory in terms of cohesion and the adhesion is low, especially for films. Specifically, an adhesion of only 14 g / inch to a polyolefin film is absolutely unacceptable for baby di...

Embodiment 3

[0086] Embodiment 3: comparative embodiment

[0087] According to the following recipe, without using any plasticizing oil, combine the following ingredients:

[0088]

[0089] YT 314 is a rosin ester tackifier available from Euro-Yser Company and is characterized by a softening point of 94°C.

[0090] The formulation exhibits the following properties:

[0091] Viscosity at 120°C = 18,000 mPa / s

[0092] Elongation at break = 234%

[0093] Fracture energy = 150 mJ

[0094] Creep time => 4,000 seconds

[0095] Eta(90)-Eta(130) / (130-90)=470

[0096] Film-to-film T-peel force = 7.6g / inch

[0097] T-peel force of film to nonwoven = 3.0 g / inch

[0098] The above properties show too high processing viscosity and very poor adhesion; especially for nonwovens, this is due to the very low permeability shown by the very steep slope of the viscosity versus temperature curve. Such as figure 1 As shown, the viscosity versus temperature curves for Example 1 and the Comparative E...

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Abstract

An adhesive composition is described that is particularly useful for application to the plastic nonwoven materials found in personal hygienic articles. The composition includes first and second ethylene vinyl acetate copolymers. The first copolymer has a high molecular weight characterized by a melt viscosity at 150 DEG C, of 100 Pascals per second or more. The second copolymer has a low molecular weight characterized by a melt viscosity at 150 DEG C of 50 Pascals per second or less. The second copolymer is present in an amount by weight percent less than or equal to the amount by weight percent of the first ethylene vinyl acetate copolymer. The composition also includes at least one tackifier resin, a hydrocarbon wax present in an amount from 0.5 % to 10 % by weight of the composition; and, a liquid plasticizer present in an amount at most 20 % by weight of the composition.

Description

field of invention [0001] The present invention relates to hot melt adhesive compositions having improved cohesion and adhesion to plastic and plastic porous substrates. Background of the invention [0002] Hot melt adhesives adhere to the surface to which they are applied by chemical adhesion and, for some surfaces, by mechanical bonding. Chemical adhesion occurs due to good interwetting between the adhesive and the substrate, which enables very intimate contact between the two substances on a molecular scale. At this scale, intermolecular forces such as dispersion forces, dipole-dipole interactions and hydrogen bonding are enabled between the adhesive molecules and those of the substrate to form the basis of chemical adhesion. Mechanical bonding occurs when the adhesive composition penetrates into the pores, defects and surface contours of the surface to which the adhesive is applied. For porous substrates, such as fibrous substrates (eg, plastic nonwovens), the observed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/08
CPCC08L23/10C08L23/04C08L2205/02C08L23/0853C08L2666/06C08L91/06C08L2666/02
Inventor I·科赞涅P·卢涅屠
Owner PROCTER & GAMBLE CO
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