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Propylene polymer based hot melt adhesive compositions exhibiting fast set times and articles comprising same

A technology of propylene polymer and setting time, which is applied in the direction of polymer adhesive additives, adhesives, adhesive additives, etc., to achieve the effect of fast setting time and good fiber tearing and adhesion characteristics

Active Publication Date: 2021-05-28
HB FULLER CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, LINXAR 127 is no longer commercially available

Method used

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  • Propylene polymer based hot melt adhesive compositions exhibiting fast set times and articles comprising same
  • Propylene polymer based hot melt adhesive compositions exhibiting fast set times and articles comprising same
  • Propylene polymer based hot melt adhesive compositions exhibiting fast set times and articles comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0075] test program

[0076] Test procedures used in the examples include the following procedures. All ratios and percentages are by weight unless otherwise indicated. Unless otherwise indicated, procedures were performed at room temperature (ie, ambient temperature from about 20°C to about 25°C) and ambient humidity (ie, 30% to 70%).

[0077] proportion

[0078] Specific gravity is determined according to ASTM D792-91.

[0079] Viscosity Test Method

[0080] According to ASTM D-3236 entitled "Standard Test Method for Apparent Viscosity of Hot Melt Adhesives and Coating Materials" (October 31, 1988), Viscosity was determined using a Brookfield Viscometer, a Brookfield Thermosel heated sample chamber and a No. 27 spindle. Results are reported in centipoise (cP).

[0081] Curing Time Test Method

[0082] Using the MEC ASM-15N Hot Melt Bonding Simulator, beads of adhesive composition measuring 5.08 cm x 0.24 cm were applied to the first sheet of WESTROCK 20 kg (44...

Embodiment E4-E9

[0121] Examples E4-E9 were prepared by mixing the ingredients in the amounts specified in Table 4 (in weight %) and heating them with stirring from 175°C to 190°C. Examples E4-E9 were then tested according to the Viscosity, Set Time, and % Fiber Tear Test Method, except that the viscosity was measured at 177°C and 135°C (as specified), and the set time was measured at 177°C and 135°C. Measured at application temperature (as specified). The results are reported in Table 4.

[0122] Table 4

[0123]

[0124] ** = The adhesive composition is at a temperature of 135°C when applied to the test substrate.

[0125] 15 = PICCOTAC 1115 C5 Hydrocarbon Tackifying Resin (Eastman Chemical Company)

[0126] 16=C80 Fischer-Tropsch wax (Sasol Wax North America Corporation (Hayward, California))

[0127] 17 = IRGANOX 1076 hindered phenol antioxidant (BASF Corporation, Florham Park, New Jersey)

[0128] 18 = The percent fiber tear for these samples was obtained using a 44# ECT Westroc...

Embodiment E22-E25

[0159] Examples E22-E25 were prepared by mixing the ingredients in the amounts specified in Table 9 (in weight %) and heating them from 175°C to 190°C with stirring.

[0160] Examples E22-E25 were then tested under the conditions specified in Table 9 according to the Specific Gravity, Set Time, Viscosity, and % Fiber Tear test methods. The results are reported in Table 9.

[0161] Table 9

[0162]

[0163] 31 = VISTAMAXX 8780 = Metallocene Catalyzed Polypropylene Elastomer (ExxonMobil)

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Abstract

The present invention discloses a hot melt adhesive composition comprising at least 35% by weight polymer; about 15% to no more than 75% by weight propylene polymer derived from at least 50% by weight propylene and 0 mole percent to about 37.5 weight percent of alpha-olefin comonomers other than propylene, the propylene polymer exhibiting a heat of fusion of about 5 joules per gram (J / g) to 60 J / g; 5 weight percent to about 50% by weight of an ethylene α-olefin copolymer derived from at least 50% by weight of ethylene and at least one α-olefin comonomer having at least three carbon atoms, the ethylene α-olefin copolymers having not more than 0.90 g / cm 3 and 18% to about 37% by weight of a wax component exhibiting a melting point greater than 80°C and a heat of fusion of at least 200 J / g.

Description

Background technique [0001] The present invention relates to hot melt adhesive compositions based on propylene polymers. [0002] Hot melt adhesive compositions are typically used to bond two substrates together and are applied to at least one of the substrates in a molten state. To be commercially viable, most hot melt adhesive compositions must maintain adhesion to substrates at room temperature. [0003] For an adhesive composition to be suitable for use in high speed packaging operations, the adhesive must exhibit fast set times and fiber tear bonds. Achieving these properties is very difficult when the hot melt adhesive composition is based on propylene polymers. Waxes are often used in an attempt to improve set time; however, waxes often have an adverse effect on adhesion. For example, polyethylene-based waxes and Fischer-Tropsch waxes tend to be incompatible with propylene-based hot melt adhesive compositions and tend to phase separate from the propylene polymer as t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J123/08C09J123/12C09J123/14C08L23/08C08L23/14C08L23/12
CPCC09J123/0815C09J123/12C08L23/0815C08L23/12C08L91/06C09J123/14C08L23/14B32B7/12C09J9/00C09J11/08
Inventor T·F·考夫曼S·C·施密特K·M·拉森A·L·施密特T·W·罗斯卡
Owner HB FULLER CO