Combination for storing and applying heat softenable moisture curable materials

Inactive Publication Date: 2002-09-19
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

0004] The present invention provides a combination and method for storing and applying moisture curable materials (e.g., adhesives, coatings or sealers) th

Problems solved by technology

With longer exposure to atmospheric moisture (e.g., over 4 days) the bladder of moisture cured material can have thickened sufficiently that it will be very difficult to rupture, however, the bladder becomes self sealing against further moisture penetration when it reaches a thickness of about 1/8 inch (0.32 cm), thereby for a long time protecting a central core of the uncured moisture curable

Method used

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  • Combination for storing and applying heat softenable moisture curable materials
  • Combination for storing and applying heat softenable moisture curable materials
  • Combination for storing and applying heat softenable moisture curable materials

Examples

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Example

[0019] Referring now to FIGS. 1, 2, and 3 of the drawing there is illustrated a combination according to the present invention for use in storing and applying a heat softenable moisture curing material (e.g., an adhesive, coating or sealer), which combination is generally designated by the reference numeral 10.

[0020] Generally, the combination 10 comprises a container assembly or syringe 12 comprising a molded tubular wall 13 of moisture vapor transmissive polymeric material having low surface energy. (e.g., fluropolymers such as Teflon; or olefins such as polypropylene or polyethylene which have critical surface tensions below about 35 dynes / centimeters and are preferred because of their low cost). The tubular wall 13 has an elongate axis 14, axially spaced inlet and outlet ends 15 and 16, and an inner surface defining a chamber 17. The container assembly 12 also includes a plunger or seal 18 within the tubular wall 13 adjacent its inlet end and 15 that is adapted to move along tha...

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Abstract

A combination for use in storing and applying moisture curable materials which includes (1) a container assembly with a tubular wall of moisture vapor transmissive polymeric material having an inner surface defining a chamber and a plunger within the tubular wall adapted to move along the wall toward an outlet end in sealing engagement with an inner surface of the wall; (2) a moisture curable material within the chamber which is solid at normal room temperature, is softenable to a suitable viscosity for application of less than 30,000 centipoise when heated to a temperature in the range of about 140 to 230 degrees Fahrenheit or 60 to 110 degrees Centigrade, and has little adhesion to the wall, even when said adhesive is moisture cured; and (3) an envelope of moisture impermeable material around the container assembly.

Description

FIELD OF THE INVENTION[0001] The present invention relates to combinations, structures, devices, and methods for use in storing and applying heat softenable moisture curable materials such as adhesives, coatings or sealers.BACKGROUND[0002] Moisture curable adhesive materials (e.g., moisture curable urethane adhesives) are well known that are solid at room temperature, that can be heated to a flowable state for application, that after being applied between objects in their heated flowable state will adhere those objects together upon cooling, and that subsequent to solidifying will cure and build adhesive strength (i.e., adhesion to those objects and internal strength) by the absorption of atmospheric moisture. Such adhesive materials after being moisture cured can develop shear adhesion strength generally in the range of about 1000 pounds per square inch or about 690 newtons per square centimeter which is significantly greater than the range of shear adhesion strength of about 250 t...

Claims

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Application Information

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IPC IPC(8): B05C5/00B05D1/26B05C11/10B05C17/005B05D3/00B65D77/00B65D83/00
CPCB05C17/00533B05C17/00546B65D77/003B65D83/0005B65D2565/388B65D83/00B65D77/00
Inventor SCHOUTEN, GERALD P.PEARSON, WALTER C.
Owner 3M INNOVATIVE PROPERTIES CO
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