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High styrene sbs hot melt adhesive

A technology of hot melt adhesives and styrene content, applied in the direction of adhesives, etc., can solve problems such as difficult mixing, and achieve the effects of long construction time, good cohesive strength, and high bond strength

Active Publication Date: 2010-01-06
BOSTIK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these very high molecular weight polymers are very difficult to blend in typical hot melt adhesive production equipment

Method used

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  • High styrene sbs hot melt adhesive
  • High styrene sbs hot melt adhesive

Examples

Experimental program
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Embodiment approach

[0062] In yet another embodiment, the adhesive comprises:

[0063] (a) 10-30% by weight of a substantially linear styrene-butadiene-styrene block copolymer having a styrene content of greater than 35%, preferably from about 38% to about 50% by weight;

[0064] (b) 5-20% by weight of end-block resin;

[0065] (c) 45-65% by weight of tackifier;

[0066] (d) 0-30% by weight oil; and

[0067] (e) 0-3% by weight of antioxidant.

[0068] In a preferred embodiment, the present invention relates to a multipurpose hot melt adhesive comprising:

[0069] (a) 15-25% by weight of a substantially linear styrene-butadiene-styrene block copolymer containing 40% by weight of styrene;

[0070] (b) 5-25% by weight aromatic end-block resin;

[0071] (c) 45-65% by weight of tackifier;

[0072] (d) 5-20% by weight of oil; and

[0073] (e) 0.3-1.5% by weight antioxidant, wherein the tackifier is present in an amount greater than that of the block copolymer, and wherein the adhesive has a visc...

Embodiment 1

[0099] Referring to Table 1, Examples 1, 2 and 3 are formulations made according to the present invention. These three high styrene content linear SBS block copolymer based formulations were compared to a commercially available high styrene SIS based elastic attachment adhesive H2598. Table 1 illustrates that Examples 1, 2 and 3 have advantageously lower viscosities than H2598 at 160°C. The adhesives of Examples 1-3 were found to have low melt viscosity, good sprayability and excellent creep retention properties. They also have a lower softening point than the control, which allows for lower application temperatures. This is important when it comes to heat sensitive substrates.

[0100] Furthermore, at the same add-on level, the adhesion retention of Examples 1, 2 and 3 is significantly higher than that of H2598, both initially and after aging. Thus, the formulations of the present invention provide substantially lower viscosity, better creep resistance than currently avail...

Embodiment 2

[0103] Referring now to Table 2, Examples 4 and 5 are formulations made according to the present invention. Examples 6 and 7 are the same formulation except using the SBS polymer described in US 6,391,960 which is a SBS based polymer containing 30% by weight styrene. Also, it should be noted that Example 7 is similar to Formulation I-2 in Table I of US 6,391,960 and Example II-2 in Table II.

[0104] It should be noted that from the comparison of the formulations of Example 4 and Example 6 and the comparison of the formulations of Example 5 and Example 7, it is evident that the viscosity of the present invention (Examples 4 and 5) is significantly lower (about 4- 6 times) the formulations in Examples 6 and 7 described in the prior art US 6,391,960. As a result, the lower viscosity formulations of the present invention (Examples 4 and 5) allow them to be sprayed onto elastic strands at significantly lower temperatures (about 130°C to about 150°C), whereas prior art US 6,391,96...

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Abstract

Multipurpose hot melt adhesive compositions which are suitable for use as both a construction and elastic attachment adhesive for disposable soft goods, such as disposable diapers, feminine sanitary napkins, surgical drapes, hospital pads, and adult incontinent products. The multipurpose hot melt adhesive compositions have a high level of creep resistance, high bond strength, and relatively low viscosity, and are composed of endblock resin in combination with a linear styrene- butadiene-styrene (SBS) copolymer wherein the copolymer has a styrene content greater than about 35% by weight, and preferably about 38% to about 50% by weight.

Description

technical field [0001] The present invention relates to multipurpose hot melt adhesives, and more particularly, the present invention relates to novel multipurpose SBS-based hot melt adhesives that can be used in the manufacture of disposable soft objects such as diapers, sanitary napkins and analog. Background technique [0002] The prior art abounds with examples of hot melt adhesives used in the construction of disposable flexible items. Specific applications for these prior art adhesives include, for example, disposable diapers, sanitary napkins, surgical drapes, hospital liners, and adult incontinence products. Also, prior art methods of applying these prior art adhesives include but are not limited to extrusion (bead or slot), spray or wheel application systems . [0003] Those skilled in the art will readily appreciate that, to date, many different polymer matrices have been used to formulate hot melt adhesives for use in the construction of disposable flexible art...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J153/02
CPCC09J153/02C08L2666/02
Inventor 冈崎元太
Owner BOSTIK INC
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