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Polyolefin-based hot melt adhesives with improved processing and bonding performance

A technology of hot-melt adhesives and polyolefin elastomers, applied in the direction of polymer adhesive additives, non-polymer adhesive additives, adhesives, etc., can solve the problem of high fluidity, wettability, strong initial adhesion, etc. question

Active Publication Date: 2017-05-31
BOSTIK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While these polymers have been used to make hot melt adhesives with better adhesion characteristics, they have not been widely used in applications requiring high flow, excellent wet-out, and strong initial bonds maintained under long-term aging middle

Method used

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  • Polyolefin-based hot melt adhesives with improved processing and bonding performance
  • Polyolefin-based hot melt adhesives with improved processing and bonding performance
  • Polyolefin-based hot melt adhesives with improved processing and bonding performance

Examples

Experimental program
Comparison scheme
Effect test

example

[0089] raw material:

[0090] Nyflex 222B is a hydrotreated naphthenic process oil available from Nynas Corporation.

[0091] Escorez 5400 is a hydrogenated cycloaliphatic hydrocarbon resin with a softening point of 103°C. It is available from ExxonMobil Chemical Company.

[0092] Escorez 5615 is a hydrogenated aromatic modified cycloaliphatic hydrocarbon resin with a softening point of 115°C. It is available from ExxonMobil Chemical Company.

[0093] Vestoplast 508 is a butene-rich poly(1-butene-co-propylene) copolymer available from Evonik Industries. It has a Brookfield viscosity of 8,000 cP at 190°C and a Ring and Ring softening point of 84°C.

[0094] Pro-fax RP591V is a random propylene copolymer available from Basel Polymers. RP591V has a melt flow rate of 100 g / 10 min (230°C / 2.16 kg) and a density of 0.90 g / cc.

[0095] L-MODU S600 is a low modulus, controlled tacticity polypropylene available from Idemitsu. It is reported to have a Brookfield viscosity of 52,00...

example 1

[0102] Example 1 (Ex 1) and comparative examples 1-3 (CE1, CE2 and CE3)

[0103] The formulations in Table 1 were produced as described above and screened for preset cold flow resistance. The first comparative example (CE1 in Table 1) produced using only the combination of L-MODU and APAO resulted in a material that showed a significant preset cold flow even after cooling. Such materials are expected to cause blocking in applications using porous substrates.

[0104] Example 1 (Ex 1) shows that replacing a portion of the L-MODU of CE 1 with a propylene copolymer results in an adhesive exhibiting zero preset cold flow by the quantitative test method. Nevertheless, qualitative ball tests show that under rapid cooling, limited flow is still seen nonetheless. This type of low but non-zero flow is proposed to provide the wet-out required for a strong bond without extensive penetration of the substrate which could lead to sticking and / or leakage.

example 2-6

[0112] Table 2. Examples 2-6 and Comparative Examples 4-10

[0113]

[0114]Examples 2-6 highlight the ability of the inventive adhesives to form strong initial and aged bonds without exhibiting blocking. Comparative Examples 4-6 help define the scope of the formulation space of the present invention as use of very low levels (less than 1 wt %) or complete omission of isotactic polypropylene Pro-fax 591V results in increased blocking in laminate applications. Comparative Examples 7-10, which used only high melting point waxes as the crystalline component, showed extremely high blocking in coating studies. These comparative examples further support the unique ability of the inventive formulations to resist blocking when applied to porous substrates such as nonwovens.

[0115] Table 3. Examples 2-6 and Comparative Examples 4-10

[0116]

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Abstract

A hot melt adhesive made from a blend of a polypropylene -based polymer, a polyolefinm elastomer, and an amorphous polyolefin. These adhesives exhibit excellent molten and pre-set flow allowing them to wet out substrates yet develop properties needed to form and maintain strong bonds making them useful for hygiene, construction, and packaging applications.

Description

[0001] Background of the invention [0002] This invention relates to hot melt adhesives, and more particularly to hot melt adhesives made from blends of polypropylene-based polymers, polyolefin elastomers, and amorphous polyolefins. These adhesives exhibit excellent melt and preset flow properties (enabling them to wet out the substrate), yet develop the properties required to form and maintain strong bonds, making them useful for hygiene, construction and packaging applications. [0003] Hot melt adhesives are used to bond substrates using a wide variety of application methods and process conditions for a variety of end uses. For example, hot melt adhesives are used to bond nonwovens, polymer films, and elastomeric components in many manufactured articles. Laminates with hot melt adhesives for bonding nonwoven and elastomeric components in strand, film or any other continuous or discrete form are especially useful in hygiene products such as diapers. [0004] The processing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J123/12C09J123/14C09J123/16C09J11/06C09J11/08
CPCC09J11/06C09J11/08C09J123/12C09J123/14C09J123/142C09J123/16C08L2205/035C08L2205/03C08L2205/02C08L23/14C08L23/142C08L23/12C08K5/01C08K5/521
Inventor S·D·格雷D·F·弗罗因德R·E·哈曼M·胡F·N-H·弗洛里斯
Owner BOSTIK INC
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