High-viscosity elastomeric adhesive composition
a technology of elastomeric adhesives and compositions, which is applied in the direction of bandages, weaving, transportation and packaging, etc., can solve the problems of conventional elastic strand laminates being rough and uncomfortable, and the vfl-sbl process being in off-line operation
Inactive Publication Date: 2007-02-15
KIMBERLY-CLARK WORLDWIDE INC
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
[0015] With the foregoing in mind, it is a feature and advantage of the invention to provide elastomeric adhesive compositions and laminates having improved adhesion and elastic properties, which can be produced at a relatively low cost. The invention also includes methods of making such elastomeric compositions and laminates.
to provide elastomeric adhesive compositions and laminates having improved adhesion and elastic properties, which can be produced at a relatively low cost. The invention also includes methods of making such elastomeric compositions and laminates.
Problems solved by technology
The cost of making stretch-bonded laminates can be relatively high due to the cost of the facing sheet or sheets, plus the cost of the elastic strands, plus the cost of the adhesive.
However, the VFL-SBL process must be in off-line operation due to process complexity.
Additionally, conventional elastic strand laminates can be rough and uncomfortable.
Furthermore, such laminates may cause red-marking on a wearer's skin if the fit is too tight and may result in leakage from the garment if the fit is too loose.
High add-on of the film laminate may generate a bulky, thick feel and appearance, and high cost.
Furthermore, the high adhesive output requirement for the film formation would make on-line processing even more difficult due to the limitation of hot melt equipment output capacity.
Additionally, high processing temperatures and relatively low viscosity are often required for use with current grid melter and drum unloader processes.
More particularly, known elastomeric adhesive compositions have been limited to a viscosity of 10,000 to 30,000 cps at processing temperatures of 285 to 410 degrees Fahrenheit due to grid melt capability, or less than 70,000 cps at 350 degrees as disclosed in U.S. Pat. No. 6,245,050.
High add-on requirements result in high cost, and high processing temperatures result in short pot life (material degradation).
Method used
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example
[0084] In this example, an elastomeric adhesive composition was formed from 54.5 wt % DPX 578 SIS copolymer and 10 wt % VECTOR 4211 SIS copolymer; both available from ExxonMobil Corporation; 35 wt % ESCOREZ 5430 tackifier, also available from ExxonMobil Corporation; and 0.50% IRGANOX 1010 antioxidant, available from Ciba Specialty Chemicals. The composition was formulated in a twin screw extruder and filled into a 58-gallon silicone lined fiber drum. Brookfield viscosity of the composition was about 145,000 cps at 380 degrees Fahrenheit (193 degrees Celsius) and about 300,000 cps at 325 degrees Fahrenheit (163 degrees Celsius). The formulation was then pumped from the fiber drum through a 1.5-inch diameter 50-foot long heated hose to adhesive head using a UNIflow model 230 drum unloader, available from Industrial Machine Manufacturing, Inc., Richmond, Va., having a 13-ton hydraulic ram powered long finger type gear pump. The temperature of the material at the adhesive head was measu...
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Abstract
High-viscosity elastomeric adhesive compositions including a high softening point tackifier resin in combination with a base polymer can be used to create elastomeric composite laminates having effective adhesion and elastic properties. The elastomeric adhesive compositions suitably have a viscosity between about 100,000 and about 500,000 cps at between about 300 degrees Fahrenheit (149 degrees Celsius) and about 350 degrees Fahrenheit (177 degrees Celsius). Facing layers, such as nonwoven webs, films, elastic strands, fastening material, absorbent material, and the like, can be laminated to one or both surfaces of the elastomeric compositions to form elastomeric composite laminates. A method of making such compositions and laminates involves forming the compositions into elastomeric adhesive films and / or strands.
Description
BACKGROUND OF THE INVENTION [0001] This invention is directed to highly viscous elastomeric adhesive compositions having improved elasticity at relatively low add-on levels. [0002] Personal care garments often include elasticized portions to create a gasket-like fit around certain openings, such as waist openings and leg openings. Laminates made from conventional elastic strands and elastic attachment adhesive are often used to create such elasticized portions. [0003] One type of elastomeric laminate is a stretch-bonded laminate that includes elastic strands produced from an extruder and bonded to a facing sheet or sheets using a hot melt adhesive. Laminates including pre-made elastic strands can be processed online but require an elastic attachment adhesive with high add-on in order to reduce strand slippage. The cost of making stretch-bonded laminates can be relatively high due to the cost of the facing sheet or sheets, plus the cost of the elastic strands, plus the cost of the ad...
Claims
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IPC IPC(8): C08J3/00A61L15/58
CPCA61L15/585C09J153/00Y10T428/28Y10T428/2878Y10T428/2852C08L53/02Y10T442/2738
InventorZHOU, PEIGUANGHALL, GREGORY K.
OwnerKIMBERLY-CLARK WORLDWIDE INC