WO1993006141A1 - Method and apparatus for preventing yellowing of benzoyl peroxide solutions in acrylic adhesives - Google Patents

Method and apparatus for preventing yellowing of benzoyl peroxide solutions in acrylic adhesives Download PDF

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Publication number
WO1993006141A1
WO1993006141A1 PCT/US1992/007404 US9207404W WO9306141A1 WO 1993006141 A1 WO1993006141 A1 WO 1993006141A1 US 9207404 W US9207404 W US 9207404W WO 9306141 A1 WO9306141 A1 WO 9306141A1
Authority
WO
WIPO (PCT)
Prior art keywords
container
solution
component
mixing
peroxide
Prior art date
Application number
PCT/US1992/007404
Other languages
French (fr)
Inventor
Naresh D. Patel
Mark W. Brown
Original Assignee
Patel Naresh D
Brown Mark W
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Patel Naresh D, Brown Mark W filed Critical Patel Naresh D
Priority to KR1019940700900A priority Critical patent/KR0162936B1/en
Priority to DE69216252T priority patent/DE69216252T2/en
Priority to AU25638/92A priority patent/AU665022B2/en
Priority to EP92919566A priority patent/EP0618932B1/en
Publication of WO1993006141A1 publication Critical patent/WO1993006141A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/32—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging two or more different materials which must be maintained separate prior to use in admixture
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16

Definitions

  • the invention relates to two component acrylic reactive adhesives used for joining plastic substrates or the like, and more specifically, relates to a method and apparatus for extending the stability and clear neutral color of organic peroxides by preventing the degrading and discoloring of such peroxides when used in two component acrylic reactive adhesives.
  • the aforementioned countertop materials are in high demand because of their functionality and aesthetic qualities.
  • the aesthetic appeal is directly related to the success in the process of joining sheets or panels in such a way that the bonded area or seam is relatively inconspicuous.
  • the seamless appearance of the countertops is highly desirable for both private homes and industrial sites.
  • the appearance of a continuous, seamless surface requires a bonding adhesive that exactly matches the countertop material.
  • the acrylic adhesives used to seam the solid plastic sheets together are prepared with pigmentation to exactly match the color of the sheets being seamed.
  • the peroxide solutions turn yellow in color as a function of time and temperature. This yellow color in turn creates color matching problems between the seam and the plastic sheet surfaces resulting in conspicuous seams which are undesirable. With the advent of lighter and brighter surfaces being introduced due to consumer demands, these surfaces are even more sensitive to the yellowed initiators in the organic peroxide solutions.
  • two component acrylic reactive adhesive is formed by mixing a first component including resins into a second component housing an initiator. The mixing process takes place within a few minutes. The mixed adhesive immediately begins to polymerize and eventually solidifies, in most instances, within one hour.
  • the first component is formulated with an amine promoter which facilitates the timely polymerization of the adhesive.
  • the promoter acts as an active source for the conversion of monomers to polymers.
  • the second component is housed in a larger container than the first component so that the first can be added to the second.
  • the second component uses a reaction initiator in the form of organic peroxides in a solution. The reaction is initiated by the peroxides because they are highly unstable compounds which readily donate free radicals, or charged hydrogen and oxygen ions to the reaction mixture. Thus, the polymerization process when the organic peroxide is added to the polymer blend.
  • the color change is due to the inherent instability of the free radical source in the organic peroxides and is a function of time and temperature. Thus, the change from clear to yellow increases over longer periods of time and/or higher temperatures. Also light may accelerate the degradation of the organic peroxide causing the color to shift from clear to yellow due to destabilization of the peroxide.
  • the novel method and apparatus provided by this invention overcomes the deficiencies to the prior art by insulating the organic peroxide in solution from air and light until the mixing of the adhesive being formed.
  • the peroxide is sealed in a container which is filled with an inert gas. Any suitable gas can be used and preferably, nitrogen gas.
  • the container of peroxide solution and gas is covered with an opaque material to protect the contents from light.
  • the peroxide solution container is unsealed allowing the gas to escape and providing a chamber to receive the liquid resins from another container.
  • mixing polermerization takes place forming an adhesive which does not turn yellow due to premature degradation of the peroxide solution.
  • the container for the peroxide solution is made from transparent or translucent material to enable viewing of the mixing of materials during the mixing operation.
  • FIGURE 1 is an elevational view partly in section of packagin apparatus of the two component adhesive to show certain detail thereof according to the present invention.
  • FIG. 1 there is shown a packaging apparatus 10 to be used preparing the two component acrylic reactive adhesive according to the present invention.
  • a first container 12 is filled with liquid resins which are polymerized during the mixture operation. Any suitable materials may be used as these materials are not a part of the instant invention. Typical materials are from about 15% to about 45% acrylic and/or ethacrylic polymers, from about 25% to about 75% acrylic and/or methacrylic ester monomers, from about 0.1% to about 2.0% amine, from about 1% to about 5% pigmentation, and from about 5% to about 45% inert fillers.
  • a second container 14 houses an organic peroxide 16 in solution. Above the peroxide solution 16 the container 14 is filled with nitrogen gas 18 which serves to insulate the peroxide solution and thus prevent its yellowing due to degradation from contact with oxygen.
  • Any suitable organic peroxide solution can be used.
  • a solution of benzoyl peroxide from about 1% to about 10% by weight in any suitable plasticizer, such as, dibutyl phthalate or dimethyl phthalate.
  • container 14 is made from a transparent or translucent material so that viewing of the mixture can be had during the mixing operation.
  • container 14 is covered with an opaque material 20 which is removed just prior to the mixing operation. In this way the peroxide solution 16 is shielded from light while in a stored condition.
  • opaque material is removed from container 14 and the container is unsealed allowing the nitrogen gas 18 to escape.
  • the contents of container 12 is emptied into container 14 where proper mixing results in a desired adhesive formed without discoloration or yellowing.
  • the completed adhesive is ready for dispensing from the container. It has been found that a proper mix ratio is about 10 to about 20 parts by weight of the materials from container 12 to about 1 part of container 14.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

A method and apparatus for storing and preparing a two component reactive acrylic adhesive in which a liquid acrylic resin (12) mixed with an organic peroxide (16) in solution without causing yellowing. A sealed container (14) is used to house the peroxide (16) solution and an inert gas, preferably nitrogen (18). The container (14) is made from a translucent or transparent material to permit viewing during the mixing operation and is covered with an opague material (20) during storage of the peroxide solution (16) and gas (18).

Description

METHOD AND APPARATUS FOR PREVENTING YELLOWING OF BENZOYL PEROXIDE SOLUTIONS IN ACRYLIC ADHESIVES
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to two component acrylic reactive adhesives used for joining plastic substrates or the like, and more specifically, relates to a method and apparatus for extending the stability and clear neutral color of organic peroxides by preventing the degrading and discoloring of such peroxides when used in two component acrylic reactive adhesives.
2. Description of the Prior Art In the past acrylic bonding materials have been widely used to join filled acrylic sheets, polyester sheets and the like. Such materials are commonplace in private homes or industrial settings as countertops for kitchens and bathroom surfaces. Products utilizing two component acrylic adhesives for bonding sheet materials are produced under the trademarks CORIAN, SURELL, AVONITE, and FOUNTAINHEAD.
The aforementioned countertop materials are in high demand because of their functionality and aesthetic qualities. The aesthetic appeal is directly related to the success in the process of joining sheets or panels in such a way that the bonded area or seam is relatively inconspicuous. The seamless appearance of the countertops is highly desirable for both private homes and industrial sites. The appearance of a continuous, seamless surface requires a bonding adhesive that exactly matches the countertop material.
Desirably the acrylic adhesives used to seam the solid plastic sheets together are prepared with pigmentation to exactly match the color of the sheets being seamed. However, it has been found that a problem exists with the organic peroxide solutions which initiate the reaction of the two component adhesives. The peroxide solutions turn yellow in color as a function of time and temperature. This yellow color in turn creates color matching problems between the seam and the plastic sheet surfaces resulting in conspicuous seams which are undesirable. With the advent of lighter and brighter surfaces being introduced due to consumer demands, these surfaces are even more sensitive to the yellowed initiators in the organic peroxide solutions. Generally speaking, two component acrylic reactive adhesive is formed by mixing a first component including resins into a second component housing an initiator. The mixing process takes place within a few minutes. The mixed adhesive immediately begins to polymerize and eventually solidifies, in most instances, within one hour.
Normally the first component is formulated with an amine promoter which facilitates the timely polymerization of the adhesive. The promoter acts as an active source for the conversion of monomers to polymers. Preferably the second component is housed in a larger container than the first component so that the first can be added to the second. Usually the second component uses a reaction initiator in the form of organic peroxides in a solution. The reaction is initiated by the peroxides because they are highly unstable compounds which readily donate free radicals, or charged hydrogen and oxygen ions to the reaction mixture. Thus, the polymerization process when the organic peroxide is added to the polymer blend. These free radicals react with the monomers thus enhancing the reactivity of the monomers and speeding up the process of monomer linking to monomer to form long chains or polymers. With all the advantages of these superior bonding adhesives, a basic problem still exists due to the uncontrollable degradation of the organic peroxides such that the solution turns from a clear organic liquid to a yellow liquid. The resulting yellow color makes it difficult if not impossible to match the color of bonding material to substrate.
The color change is due to the inherent instability of the free radical source in the organic peroxides and is a function of time and temperature. Thus, the change from clear to yellow increases over longer periods of time and/or higher temperatures. Also light may accelerate the degradation of the organic peroxide causing the color to shift from clear to yellow due to destabilization of the peroxide.
SUMMARY OF THE INVENTION The novel method and apparatus provided by this invention overcomes the deficiencies to the prior art by insulating the organic peroxide in solution from air and light until the mixing of the adhesive being formed. The peroxide is sealed in a container which is filled with an inert gas. Any suitable gas can be used and preferably, nitrogen gas. Desirably, the container of peroxide solution and gas is covered with an opaque material to protect the contents from light. When it is desired to mix the two component materials into the reactive adhesive, the peroxide solution container is unsealed allowing the gas to escape and providing a chamber to receive the liquid resins from another container. Upon mixing polermerization takes place forming an adhesive which does not turn yellow due to premature degradation of the peroxide solution. Desirably the container for the peroxide solution is made from transparent or translucent material to enable viewing of the mixing of materials during the mixing operation.
DESCRIPTION OF THE DRAWING
Having thus described the invention in general terms, reference will now be made to the accompanying drawings in which:
FIGURE 1 is an elevational view partly in section of packagin apparatus of the two component adhesive to show certain detail thereof according to the present invention.
DETAILED DESCRIPTION OF THE INVENTION Referring to Figure 1 there is shown a packaging apparatus 10 to be used preparing the two component acrylic reactive adhesive according to the present invention. A first container 12 is filled with liquid resins which are polymerized during the mixture operation. Any suitable materials may be used as these materials are not a part of the instant invention. Typical materials are from about 15% to about 45% acrylic and/or ethacrylic polymers, from about 25% to about 75% acrylic and/or methacrylic ester monomers, from about 0.1% to about 2.0% amine, from about 1% to about 5% pigmentation, and from about 5% to about 45% inert fillers.
In accordance with the present invention a second container 14 houses an organic peroxide 16 in solution. Above the peroxide solution 16 the container 14 is filled with nitrogen gas 18 which serves to insulate the peroxide solution and thus prevent its yellowing due to degradation from contact with oxygen. Any suitable organic peroxide solution can be used. Preferably a solution of benzoyl peroxide from about 1% to about 10% by weight in any suitable plasticizer, such as, dibutyl phthalate or dimethyl phthalate. Preferably container 14 is made from a transparent or translucent material so that viewing of the mixture can be had during the mixing operation. Desirably container 14 is covered with an opaque material 20 which is removed just prior to the mixing operation. In this way the peroxide solution 16 is shielded from light while in a stored condition. According to the invention opaque material is removed from container 14 and the container is unsealed allowing the nitrogen gas 18 to escape. The contents of container 12 is emptied into container 14 where proper mixing results in a desired adhesive formed without discoloration or yellowing. When proper mixing has resulted as observed through the transparent or translucent container 14, the completed adhesive is ready for dispensing from the container. It has been found that a proper mix ratio is about 10 to about 20 parts by weight of the materials from container 12 to about 1 part of container 14.
Various other modifications of the invention are contemplated which will be apparent to those skilled in the art and which can be resorted to without departing from the spirit and scope of the invention as defined by the following appended claims.

Claims

I CLAIM
1. An improved method of preparing a two component reactive acrylic adhesive comprising the steps of forming a first component including an organic peroxide in solution in a sealed container filled with an inert gas; forming a second component including liquid acrylic polymerizable resin; breaking the sealed container allowing the gas to escape and filling the container with the second component and causing mixing thereof to produce an adhesive without yellowing in color.
2. A method according to Claim 1 wherein said gas is nitrogen.
3. A method according to Claim 1 wherein said container is made from a transparent material.
4. A method according to Claim 1 wherein said container is made from a translucent material.
5. A method according to Claim 1 wherein said container is covered with an opaque material until just prior to mixing.
6. Packaging apparatus for a two component reactive acrylic adhesive comprising a first sealed container for housing a predetermined amount of an organic peroxide in solution and an inert gas; and a second container for housing a predetermined amount of liquid polymerizable resin for mixing with said first container after braking the seal thereof.
7. Apparatus according to Claim 6 wherein said inert gas is nitrogen.
8. Apparatus according to Claim 6 wherein said first container is made from a transparent material.
9. Apparatus according to Claim 6 wherein said first container is made from translucent material.
10. Apparatus according to Claim 6 wherein said first container is covered with an opaque material during storage.
PCT/US1992/007404 1991-09-20 1992-09-01 Method and apparatus for preventing yellowing of benzoyl peroxide solutions in acrylic adhesives WO1993006141A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
KR1019940700900A KR0162936B1 (en) 1991-09-20 1992-09-01 Method and apparatus for preventing yellowing of benzoyl peroxide solutions in acrylic adhesives
DE69216252T DE69216252T2 (en) 1991-09-20 1992-09-01 METHOD AND PACKAGING DEVICE TO PREVENT THE YELLOWING OF ORGANIC PEROXIDE SOLUTIONS IN ACRYLIC-BASED ADHESIVES
AU25638/92A AU665022B2 (en) 1991-09-20 1992-09-01 Method and apparatus for preventing yellowing of benzoyl peroxide solutions in acrylic adhesives
EP92919566A EP0618932B1 (en) 1991-09-20 1992-09-01 Method and packaging apparatus for preventing yellowing of organic peroxide solutions in acrylic adhesives

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/763,278 US5171813A (en) 1991-09-20 1991-09-20 Method and apparatus for preventing yellowing of benzoyl peroxide solutions in acrylic adhesives
US763,278 1991-09-20

Publications (1)

Publication Number Publication Date
WO1993006141A1 true WO1993006141A1 (en) 1993-04-01

Family

ID=25067371

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1992/007404 WO1993006141A1 (en) 1991-09-20 1992-09-01 Method and apparatus for preventing yellowing of benzoyl peroxide solutions in acrylic adhesives

Country Status (9)

Country Link
US (1) US5171813A (en)
EP (1) EP0618932B1 (en)
JP (1) JP2701982B2 (en)
KR (1) KR0162936B1 (en)
AU (1) AU665022B2 (en)
CA (1) CA2119465C (en)
DE (1) DE69216252T2 (en)
ES (1) ES2098533T3 (en)
WO (1) WO1993006141A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2167479C (en) * 1995-01-17 2006-04-11 Andrew J. O'neill Forced encapsulation cable splice enclosure including a container for existing encapsulant
WO2003008191A1 (en) * 2001-07-16 2003-01-30 Garitano Gilbert G Images in solids surfaces
GB201316892D0 (en) * 2013-09-23 2013-11-06 Mix 14 Ltd Multi-part adhesive and its method of manufacture
US10011399B1 (en) * 2015-05-15 2018-07-03 Loren S. Adell Fabrication of polymeric dental devices and aids

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3926906A (en) * 1968-06-14 1975-12-16 Johnson & Johnson Dental filling package
US3928280A (en) * 1972-03-03 1975-12-23 Wallace A Erickson & Company Preparation of dental restorative filling materials
US4182035A (en) * 1976-08-31 1980-01-08 Kuraray Company Limited Adhesive compositions for the hard tissues of the human body

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL92396C (en) * 1900-01-01
US3841467A (en) * 1972-06-20 1974-10-15 Univ Missouri Product and process for making improved strength dental amalgam

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3926906A (en) * 1968-06-14 1975-12-16 Johnson & Johnson Dental filling package
US3928280A (en) * 1972-03-03 1975-12-23 Wallace A Erickson & Company Preparation of dental restorative filling materials
US4182035A (en) * 1976-08-31 1980-01-08 Kuraray Company Limited Adhesive compositions for the hard tissues of the human body

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP0618932A4 *

Also Published As

Publication number Publication date
CA2119465A1 (en) 1993-04-01
KR0162936B1 (en) 1999-01-15
EP0618932B1 (en) 1996-12-27
EP0618932A4 (en) 1995-10-04
US5171813A (en) 1992-12-15
AU2563892A (en) 1993-04-27
CA2119465C (en) 1997-06-17
AU665022B2 (en) 1995-12-14
JP2701982B2 (en) 1998-01-21
DE69216252T2 (en) 1997-04-17
ES2098533T3 (en) 1997-05-01
EP0618932A1 (en) 1994-10-12
JPH06511026A (en) 1994-12-08
DE69216252D1 (en) 1997-02-06

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