CA2145244C - Pressure bonding adhesive and adhesive coated product - Google Patents
Pressure bonding adhesive and adhesive coated productInfo
- Publication number
- CA2145244C CA2145244C CA002145244A CA2145244A CA2145244C CA 2145244 C CA2145244 C CA 2145244C CA 002145244 A CA002145244 A CA 002145244A CA 2145244 A CA2145244 A CA 2145244A CA 2145244 C CA2145244 C CA 2145244C
- Authority
- CA
- Canada
- Prior art keywords
- adhesive
- latex
- natural rubber
- pressure bonding
- present
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Fee Related
Links
Classifications
-
- 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
- C09J151/00—Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
- C09J151/04—Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers grafted on to rubbers
-
- 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
- C09J107/00—Adhesives based on natural rubber
- C09J107/02—Latex
-
- 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
- C09J111/00—Adhesives based on homopolymers or copolymers of chloroprene
- C09J111/02—Latex
-
- 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
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/02—Homopolymers or copolymers of acids; Metal or ammonium salts thereof
-
- 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
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/21—Paper; Textile fabrics
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
A pressure bonding adhesive composition is provided for use on cellulosic substrates which will not become tacky under high temperatures, lose adhesive properties due to contact with silicone oils, "block" when stacked prior to printing, or lose bond-forming ability with age. Non-thermoplastic pigment particles and a compound selected from the group consisting of a natural rubber latex, a graft copolymer of natural rubber and acrylic monomer and a blend of the natural rubber latex and the graft copolymer are mixed together to form an adhesive with a glass transition temperature in the range of -10 to -78.degree.C and a green strength of 0.05 to 0.75 p.s.i.. The adhesive may also optionally contain a chloroprene-methacrylic acid copolymer latex and a vinylmethacrylic acid copolymer latex.
Description
STD 501 PI ~ 452 PRESSURE BOI~ G ADHESIVE AND
ADXES~ VE COATED PRODUCT
Backqround of the InventiorL
This invention relate3 to a pressure bonding adhesive for u3e 5 on paper product3 which are subj ected to high temperature condition3, and more particularly to an adhe8ive for use on documents such as mailer forms produced by laser printing.
The use of ~lself" adhesives for use in mailer forms is well known. In the past, heat ~;eal adhesives were u3ed on form3 which 10 were not 3ubj ected to heat and pre33ure until the f inal printed form wa3 3ealed by applying heat to the adhe3ive. However, new adhe3ive3 were required with the advent of la3er printer3, which generally u3e heat and pres3ure - (fu3er roll3) for adhering toner image3 to paper. The3e ad~le3ive3 need to form 3trong bond3 under pre33ure alone and be able to with3tand fu3er roll temperature3 of up to 232 C without becoming tacky .
Much effort ha3 been made to adapt "3elf" adhe3ive3 3uch a3 natural rubber latex coating3 to the need3 of la3er printer3.
The3e coating3 generally are adherent with other coating3 of the 3ame material but are not adherent toward other surfaces. The pre33ure 3eal3 made after printing in la3er printer3 u3ing 3uch "3elf" adhe3ive3 have not been entirely 3ati3factory for 3everal rea30n3. Fir3t, 3uch adhe3ive3 have adhered to the fu3er roll3, cau3ing fouling or jamming. Second, 3ilicone oil3 which are commonly applied to fu3er roll 3urfaces have tran3ferred to the adhe3ive3, preventing formation of 3trong self-adhesive bonds.
Third, adhesive coated form3 are 3tored in 3tack3, pack3 or roll3 prior to printing and "blocking" often occur3, which cau3e3 the adjacent pile3 to 3tick to~ether, thu3 preventing proper feeding.
Finally, 3uch prior adhe3ive coating3 103e bond-forming ability with age.
Some ef forts have been made to correct these problems using adhesives such as the one d:isclosed in U.S. patent 4,918,128. This adhesive is composed of a graft polymerized natural rubber latex with styrene and methyl methacrylate comonomers and a non-thermopla3tic particulate solid.
Still, there remains a need in the art for a pressure bonding adhesive which will not become tacky under high temperatures, lose 214~24~
adheeive properties due to contact with silicone oils, "block" when stacked prior to printing, or lose bond-forming ability with age.
SummarY of the Invention The present invention meets that need by providing a pressure bonding adhesive for use on laser printed documents which combines non-thermoplastic pigment particles and a compound selected from the group consisting of a natural rubber latex, a ~[raf t copolymer of natural rubber and acrylic monomer and a blend of the natural rubber latex and the graf t copolymer . These compounds produce an adhesive capable of withstanding the heat and pressure conditions of the fuser rolls in sheet fed and web fed laser printers such as the Xerox 4050, the SiemenE; 2140, the IBM 3800 and 3900 and still form a secure bond under pressure alone.
The adhesive comprises non-thermoplastic pigment particles, a compound selected from the group consisting of unmodified natural rubber latex, a graf t copolymer of natural rubber and acrylic monomer and a blend of the ~nmodified natural rubber latex and the graft copolymer and optionally one or more compounds selected from the group consisting of chloroprene-methacrylic acid copolymer latex and a vinyl-methacry~ ic acid copolymer latex. The adhesive has a glass transition tem~?erature (Tg) in the range of -10 to -78C and a green strength of 0 . 05 to 0 . 75 p . s . i . .
In a preferred embodiment, the acrylic monomer used in the graft copolymer is choseII from the group consisting of ethyl acrylate, methyl methacrylate and ethyl methacrylate. In addition, the graft copolymer contains the acrylic monomer in a weight percent of 30 to 50% and has a glass transition temperature of from about -60 to -65C. When present, the optional chloroprene-methacrylic acid copolymer latex should have a glass transition temperature of about -45C and be used in the adhesive in a weight percent of from 10 to 40%. It is also desirable for the optional vinyl-methacrylic acid copolymer latex when present to have a glass transition temperature in the range of from -14 to -25C and be used in the adhesive in a ~ieight percent of from 10 to 40%.
The natural rubber la~ex and the graft copolymer of natural rubber and acrylic monomer of the present invention give the adhesive the properties necessary for effective pressure bonding.
The graft copolymer also reduces tack, which prevents blocking.
The non-thermoplastic pigment also reduces surface tack to prevent -21~24~
blocking and absorbs the s:ilicone oils ueed on fuser rolls. The optional chluL ,~Lelle-methacrylic acid copolymer latex and vinyl-methacrylic acid copolymer latex help to prevent premature drying of the adhesive during the application of the adhesive to a 3ubstrate.
Accordingly, it is an obj ect of the present invention to provide an adhesive which will not become tacky under high temperatures, loee adhesive properties due to contact with silicone oils, "block" when stacked prior to printing, or lose bond-forming ability with age.
Brief Deecription of the D~awinqs Fig. 1 illustrates a typical cellulosic substrate which has been coated with a pressure bonding adhesive in accordance with the present invention.
Detailed Deec~i~tion of the Preferred Embodimente Fig. 1 illustrates a typical embodiment of the adhesive coated product of the present invention. A single sheet of paper 10 is used to make a mailer document 12. The adhesive is applied to the mailer at lines 70, 72, 80 and 82.
The adhesive may be applied to any suitable cellulosic substrate and plastic sub3trates, preferably those having porous surfaces that would allow the adhesive to adhere securely such as Tyvek polyolefins. In a preferred embodiment, the adhesive is applied to the substrate to provide a thickness when dry of from 0.3 to 0 7 mil, and most preferably about 0.5 mil. The adhesive may be used to form various mailer products or envelopes which require adhesives.
In its preferred form, the adhesive of the present invention comprises a blend of a non- thermoplastic pigment particle such as silica which has a particle size of 1-40 microns, a natural rubber latex which is not chemically modified, and a graft copolymer of natural rubber and acrylic monomer, the monomer being selected from the group consisting of ethyl acrylate, methyl methacrylate and ethyl methacrylate. The adhesive also optionally contains a chloroprene-methacrylic acid copolymer latex and a vinyl-methacrylic acid copolymer latex. The required physical characteristic~ of the final adhesive are a glass transition temperature (Tg) in the range of -10 to -78C and a green strength of 0.05 to 0.75 p.s.i
ADXES~ VE COATED PRODUCT
Backqround of the InventiorL
This invention relate3 to a pressure bonding adhesive for u3e 5 on paper product3 which are subj ected to high temperature condition3, and more particularly to an adhe8ive for use on documents such as mailer forms produced by laser printing.
The use of ~lself" adhesives for use in mailer forms is well known. In the past, heat ~;eal adhesives were u3ed on form3 which 10 were not 3ubj ected to heat and pre33ure until the f inal printed form wa3 3ealed by applying heat to the adhe3ive. However, new adhe3ive3 were required with the advent of la3er printer3, which generally u3e heat and pres3ure - (fu3er roll3) for adhering toner image3 to paper. The3e ad~le3ive3 need to form 3trong bond3 under pre33ure alone and be able to with3tand fu3er roll temperature3 of up to 232 C without becoming tacky .
Much effort ha3 been made to adapt "3elf" adhe3ive3 3uch a3 natural rubber latex coating3 to the need3 of la3er printer3.
The3e coating3 generally are adherent with other coating3 of the 3ame material but are not adherent toward other surfaces. The pre33ure 3eal3 made after printing in la3er printer3 u3ing 3uch "3elf" adhe3ive3 have not been entirely 3ati3factory for 3everal rea30n3. Fir3t, 3uch adhe3ive3 have adhered to the fu3er roll3, cau3ing fouling or jamming. Second, 3ilicone oil3 which are commonly applied to fu3er roll 3urfaces have tran3ferred to the adhe3ive3, preventing formation of 3trong self-adhesive bonds.
Third, adhesive coated form3 are 3tored in 3tack3, pack3 or roll3 prior to printing and "blocking" often occur3, which cau3e3 the adjacent pile3 to 3tick to~ether, thu3 preventing proper feeding.
Finally, 3uch prior adhe3ive coating3 103e bond-forming ability with age.
Some ef forts have been made to correct these problems using adhesives such as the one d:isclosed in U.S. patent 4,918,128. This adhesive is composed of a graft polymerized natural rubber latex with styrene and methyl methacrylate comonomers and a non-thermopla3tic particulate solid.
Still, there remains a need in the art for a pressure bonding adhesive which will not become tacky under high temperatures, lose 214~24~
adheeive properties due to contact with silicone oils, "block" when stacked prior to printing, or lose bond-forming ability with age.
SummarY of the Invention The present invention meets that need by providing a pressure bonding adhesive for use on laser printed documents which combines non-thermoplastic pigment particles and a compound selected from the group consisting of a natural rubber latex, a ~[raf t copolymer of natural rubber and acrylic monomer and a blend of the natural rubber latex and the graf t copolymer . These compounds produce an adhesive capable of withstanding the heat and pressure conditions of the fuser rolls in sheet fed and web fed laser printers such as the Xerox 4050, the SiemenE; 2140, the IBM 3800 and 3900 and still form a secure bond under pressure alone.
The adhesive comprises non-thermoplastic pigment particles, a compound selected from the group consisting of unmodified natural rubber latex, a graf t copolymer of natural rubber and acrylic monomer and a blend of the ~nmodified natural rubber latex and the graft copolymer and optionally one or more compounds selected from the group consisting of chloroprene-methacrylic acid copolymer latex and a vinyl-methacry~ ic acid copolymer latex. The adhesive has a glass transition tem~?erature (Tg) in the range of -10 to -78C and a green strength of 0 . 05 to 0 . 75 p . s . i . .
In a preferred embodiment, the acrylic monomer used in the graft copolymer is choseII from the group consisting of ethyl acrylate, methyl methacrylate and ethyl methacrylate. In addition, the graft copolymer contains the acrylic monomer in a weight percent of 30 to 50% and has a glass transition temperature of from about -60 to -65C. When present, the optional chloroprene-methacrylic acid copolymer latex should have a glass transition temperature of about -45C and be used in the adhesive in a weight percent of from 10 to 40%. It is also desirable for the optional vinyl-methacrylic acid copolymer latex when present to have a glass transition temperature in the range of from -14 to -25C and be used in the adhesive in a ~ieight percent of from 10 to 40%.
The natural rubber la~ex and the graft copolymer of natural rubber and acrylic monomer of the present invention give the adhesive the properties necessary for effective pressure bonding.
The graft copolymer also reduces tack, which prevents blocking.
The non-thermoplastic pigment also reduces surface tack to prevent -21~24~
blocking and absorbs the s:ilicone oils ueed on fuser rolls. The optional chluL ,~Lelle-methacrylic acid copolymer latex and vinyl-methacrylic acid copolymer latex help to prevent premature drying of the adhesive during the application of the adhesive to a 3ubstrate.
Accordingly, it is an obj ect of the present invention to provide an adhesive which will not become tacky under high temperatures, loee adhesive properties due to contact with silicone oils, "block" when stacked prior to printing, or lose bond-forming ability with age.
Brief Deecription of the D~awinqs Fig. 1 illustrates a typical cellulosic substrate which has been coated with a pressure bonding adhesive in accordance with the present invention.
Detailed Deec~i~tion of the Preferred Embodimente Fig. 1 illustrates a typical embodiment of the adhesive coated product of the present invention. A single sheet of paper 10 is used to make a mailer document 12. The adhesive is applied to the mailer at lines 70, 72, 80 and 82.
The adhesive may be applied to any suitable cellulosic substrate and plastic sub3trates, preferably those having porous surfaces that would allow the adhesive to adhere securely such as Tyvek polyolefins. In a preferred embodiment, the adhesive is applied to the substrate to provide a thickness when dry of from 0.3 to 0 7 mil, and most preferably about 0.5 mil. The adhesive may be used to form various mailer products or envelopes which require adhesives.
In its preferred form, the adhesive of the present invention comprises a blend of a non- thermoplastic pigment particle such as silica which has a particle size of 1-40 microns, a natural rubber latex which is not chemically modified, and a graft copolymer of natural rubber and acrylic monomer, the monomer being selected from the group consisting of ethyl acrylate, methyl methacrylate and ethyl methacrylate. The adhesive also optionally contains a chloroprene-methacrylic acid copolymer latex and a vinyl-methacrylic acid copolymer latex. The required physical characteristic~ of the final adhesive are a glass transition temperature (Tg) in the range of -10 to -78C and a green strength of 0.05 to 0.75 p.s.i
2~45~4 The non-thermoplastic filler pigment may be any convenient organlc or inorganic hard-particle pigment such as, for example, silica gel. It is used in a solids weight percent of 1 to 10%, most preferably about 2~. The effect the pigment has on the dried 5 adheGive film is to reduce surface tack, which prevents blocking and improves feeding of forms having the adhesive. It also absorbs the silicone oils uæed on many printer fuser rolls.
The unmodif ied natural rubber latex is a natural product obtained from rubber trees. It can be used in a solids weight 10 percent of 0 to 99~, and ntost preferably in an aqueous emulsion , r nt~;n~ng about 559~ rubber solids. It is comprised mainly of cis 1,4-polyi#oprene (93-95 wt 96), moigture (0.3-1.0 wt ~), acetone soluble residue (1 . 5-4 . 5 wt ~), proteins (2 . 0-3 . 0 wt ~), and ash (0.2-0.5 wt ~). The nominal properties of a dried film of natural 15 rubber are a glass transition temperature of -72C, a dielectric constant of 2 . 3 7 and a green strength of 0 . 72 p . 8 . i . .
The graft polymerized natural rubber latex is produced by reacting the natural latex with an acrylic monomer. This result~
in random and block copolynterization of the acrylic monomer with 20 the natural rubber of pol~isoprene. This treatment provides a dried film adhesive with increasing hardness, reducing tack and blocking tendency, raises the glass transition temperature from about -72C to about -60 to -65C, and decreases the bond strength formed when two films are joined by pressure. At some ratios, the 25 resultant copolymer may sho~r two glass transition temperatures, one due to the natural rubber alld one due to the added copolymer. The graft copolymers used in the present invention contain from 30~ to 5096 of the acrylic comonomer based on the weight of the copolymer.
The latex is preferably used a~ an aqueous emulsion of about 589~
30 solids. However, the graft copolymer can be used in a solids weight percent of from 0 to 999~.
The optional chloroprene-methacrylic acid copolymer latex preferably has a glass tra~lsition temperature of about -45C and is present in the adhesive in a weight percent of from 10 to 40~.
35 A satisfactory chloroprene-methacrylic acid copolymer for use in the present invention is Neoprene 115 from du Pont, which is supplied as a 45~6 solids content composition.
The optional vinyl-methacrylic acid copolyrner latex has a glass transition temperature in the range of from -14 to -25C and 21~524~
, is present in the adhesive in a weight percent of from 10 to 40%.
An example of a vinyl-methacrylic acid copolymer latex which can be used in the present invention is Haloflex 320 from Zeneca Resins, a division of ICI.
The final adhesive may also contain water, and lesser amounts of ammonia, defoamer and dye. The water helps to prevent premature drying and can be present in a weight percent of 1 to 10% in addition to the water already present in the aqueous latex emulsions. The ammonia helps to stabilize the rubber latex and provide a basic pH. It carL be used in a weight percent of 0.1 to 1. 0% . The defoamer is used to prevent foaming of the adhesive in use and during application. It can be used in a weight percent of o to 0.2%. The dye is used for aesthetic reasons to make the adhesive more visible to the user and can be any color. The dye should be water-soluble and can be used in a weight percent of 0 to 0.2%.
In order that the invention may be more readily understood, reference is made to the following example which is intended to illustrate the invention, but not limit the scope thereof.
Exam~le 1 A pressure bonding adhesive composition was prepared in accordance with the present invention by blending 75% (weight percentage) unmodified natural rubber latex (55% solids), 17% of a graft copolymer of natural rubber and methyl methacrylate (58%
solids), 5.1% water, 2% inorganic CabosiI silica pigment particles from Cabot, 0.4% ammonia, 0.01% water soluble dye and 0.019~
defoamer The composition was applied by a Flexo Analox roll at a thickness of from 0.25 to 0.5 mil to a cellulosic substrate and then dried using a radio frequency dryer. The dried film adhesive exhibited satisfactory stability under high temperatures and did not lose adhesive properties due to contact with silicone oils, ~block" when stacked prior to printing, or lose bond-forming ability with age.
The unmodif ied natural rubber latex is a natural product obtained from rubber trees. It can be used in a solids weight 10 percent of 0 to 99~, and ntost preferably in an aqueous emulsion , r nt~;n~ng about 559~ rubber solids. It is comprised mainly of cis 1,4-polyi#oprene (93-95 wt 96), moigture (0.3-1.0 wt ~), acetone soluble residue (1 . 5-4 . 5 wt ~), proteins (2 . 0-3 . 0 wt ~), and ash (0.2-0.5 wt ~). The nominal properties of a dried film of natural 15 rubber are a glass transition temperature of -72C, a dielectric constant of 2 . 3 7 and a green strength of 0 . 72 p . 8 . i . .
The graft polymerized natural rubber latex is produced by reacting the natural latex with an acrylic monomer. This result~
in random and block copolynterization of the acrylic monomer with 20 the natural rubber of pol~isoprene. This treatment provides a dried film adhesive with increasing hardness, reducing tack and blocking tendency, raises the glass transition temperature from about -72C to about -60 to -65C, and decreases the bond strength formed when two films are joined by pressure. At some ratios, the 25 resultant copolymer may sho~r two glass transition temperatures, one due to the natural rubber alld one due to the added copolymer. The graft copolymers used in the present invention contain from 30~ to 5096 of the acrylic comonomer based on the weight of the copolymer.
The latex is preferably used a~ an aqueous emulsion of about 589~
30 solids. However, the graft copolymer can be used in a solids weight percent of from 0 to 999~.
The optional chloroprene-methacrylic acid copolymer latex preferably has a glass tra~lsition temperature of about -45C and is present in the adhesive in a weight percent of from 10 to 40~.
35 A satisfactory chloroprene-methacrylic acid copolymer for use in the present invention is Neoprene 115 from du Pont, which is supplied as a 45~6 solids content composition.
The optional vinyl-methacrylic acid copolyrner latex has a glass transition temperature in the range of from -14 to -25C and 21~524~
, is present in the adhesive in a weight percent of from 10 to 40%.
An example of a vinyl-methacrylic acid copolymer latex which can be used in the present invention is Haloflex 320 from Zeneca Resins, a division of ICI.
The final adhesive may also contain water, and lesser amounts of ammonia, defoamer and dye. The water helps to prevent premature drying and can be present in a weight percent of 1 to 10% in addition to the water already present in the aqueous latex emulsions. The ammonia helps to stabilize the rubber latex and provide a basic pH. It carL be used in a weight percent of 0.1 to 1. 0% . The defoamer is used to prevent foaming of the adhesive in use and during application. It can be used in a weight percent of o to 0.2%. The dye is used for aesthetic reasons to make the adhesive more visible to the user and can be any color. The dye should be water-soluble and can be used in a weight percent of 0 to 0.2%.
In order that the invention may be more readily understood, reference is made to the following example which is intended to illustrate the invention, but not limit the scope thereof.
Exam~le 1 A pressure bonding adhesive composition was prepared in accordance with the present invention by blending 75% (weight percentage) unmodified natural rubber latex (55% solids), 17% of a graft copolymer of natural rubber and methyl methacrylate (58%
solids), 5.1% water, 2% inorganic CabosiI silica pigment particles from Cabot, 0.4% ammonia, 0.01% water soluble dye and 0.019~
defoamer The composition was applied by a Flexo Analox roll at a thickness of from 0.25 to 0.5 mil to a cellulosic substrate and then dried using a radio frequency dryer. The dried film adhesive exhibited satisfactory stability under high temperatures and did not lose adhesive properties due to contact with silicone oils, ~block" when stacked prior to printing, or lose bond-forming ability with age.
Claims (20)
1. An adhesive coated cellulosic substrate for use in producing laser printed documents comprising:
a cellulosic substrate coated with an adhesive formed from non-thermoplastic pigment particles, a compound selected from the group consisting of a natural rubber latex, a graft copolymer of natural rubber and acrylic monomer and a blend of said natural rubber latex and said graft copolymer, and optionally one or more compounds selected from the group consisting of chloroprene-methacrylic acid copolymer latex and vinyl-methacrylic acid copolymer latex, said adhesive having a glass transition temperature in the range of from -10 to -78°C and a green strength of 0.05 to 0.75 p.s.i..
a cellulosic substrate coated with an adhesive formed from non-thermoplastic pigment particles, a compound selected from the group consisting of a natural rubber latex, a graft copolymer of natural rubber and acrylic monomer and a blend of said natural rubber latex and said graft copolymer, and optionally one or more compounds selected from the group consisting of chloroprene-methacrylic acid copolymer latex and vinyl-methacrylic acid copolymer latex, said adhesive having a glass transition temperature in the range of from -10 to -78°C and a green strength of 0.05 to 0.75 p.s.i..
2. The adhesive coated cellulosic substrate of claim 1 wherein said non-thermoplastic pigment particles have a particle size of 1-40 microns and are present in the final adhesive in a solids weight percent of 1 to 10%.
3. The adhesive coated cellulosic substrate of claim 2 wherein said non-thermoplastic pigment particles are present in the final adhesive in a solids weight percent of about 2%.
4. The adhesive coated cellulosic substrate of claim 1 wherein said natural rubber late is present and is not chemically modified.
5. The adhesive coated cellulosic substrate of claim 4 wherein said graft copolymer is present and has an acrylic monomer content of 30 to 50% by weight.
6. The adhesive coated cellulosic substrate of claim 5 wherein said graft copolymer has a glass transition temperature of from about -60 to -65°C.
7. The adhesive coated cellulosic substrate of claim 6 wherein said acrylic monomer is selected from the group consisting of alkyl acrylates and alkyl methacrylates.
8. The adhesive coated cellulosic substrate of claim 7 wherein said acrylic monomer is selected from the group consisting of ethyl acrylate, methyl methacrylate and ethyl methacrylate.
9. The adhesive coated cellulosic substrate of claim 1 wherein said chloroprene-methacrylic acid copolymer latex is present and said copolymer latex has a glass transition temperature of about -45°C.
10. The adhesive coated cellulosic substrate of claim 1 wherein said vinyl-methacrylic acid copolymer latex is present and has a glass transition temperature in the range of from -14 to -25°C.
11. A pressure bonding adhesive for use on laser printed documents comprising non-thermoplastic pigment particles, a compound selected from the group consisting of a natural rubber latex, a graft copolymer of natural rubber and acrylic monomer and a blend of said natural rubber latex and said graft copolymer and optionally one or more compounds selected from the group consisting of chloroprene-methacrylic acid copolymer latex and a vinyl-methacrylic acid copolymer latex, said adhesive having a glass transition temperature in the range of -10 to -78°C and a green strength of 0.05 to 0.75 p.s.i.
12. The pressure bonding adhesive of claim 11 wherein said non-thermoplastic pigment particles have a particle size of 1-40 microns and are present in the final adhesive in a solids weight percent of 1 to 10%.
13. The pressure bonding adhesive of claim 12 wherein said non-thermoplastic pigment particles are present in the final adhesive in a solids weight percent of about 2%.
14. The pressure bonding adhesive of claim 11 wherein said natural rubber latex is present and is not chemically modified.
15. The pressure bonding adhesive claim 14 wherein said graft copolymer is present and has an acrylic monomer content of 30 to 50% by weight.
16. The pressure bonding adhesive of claim 15 wherein said graft copolymer has a glass transition temperature of from about -60 to -65°C.
17. The pressure bonding adhesive of claim 16 wherein said acrylic monomer is selected from the group consisting of alkyl acrylates and alkyl methacrylates.
18. The pressure bonding adhesive of claim 17 wherein said acrylic monomer is selected from the group consisting of ethyl acrylate, methyl methacrylate and ethyl methacrylate.
19. The pressure bonding adhesive of claim 11 wherein a chloroprene-methacrylic acid copolymer latex is present and said copolymer latex has a glass transition temperature of about -45°C.
20. The pressure bonding adhesive of claim 11 wherein a vinyl-methacrylic acid copolymer latex is present and said copolymer has a glass transition temperature in the range of from -14 to -25°C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002145244A CA2145244C (en) | 1995-03-22 | 1995-03-22 | Pressure bonding adhesive and adhesive coated product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002145244A CA2145244C (en) | 1995-03-22 | 1995-03-22 | Pressure bonding adhesive and adhesive coated product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2145244A1 CA2145244A1 (en) | 1996-09-23 |
| CA2145244C true CA2145244C (en) | 1998-08-04 |
Family
ID=4155485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002145244A Expired - Fee Related CA2145244C (en) | 1995-03-22 | 1995-03-22 | Pressure bonding adhesive and adhesive coated product |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2145244C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2610317A1 (en) * | 2011-12-26 | 2013-07-03 | Bostik SA | Peelable adhesive composition |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7169829B2 (en) * | 2018-09-25 | 2022-11-11 | 日東電工株式会社 | Adhesive sheet for electronic devices |
| JP7169828B2 (en) * | 2018-09-25 | 2022-11-11 | 日東電工株式会社 | Adhesive sheet for electronic devices |
-
1995
- 1995-03-22 CA CA002145244A patent/CA2145244C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2610317A1 (en) * | 2011-12-26 | 2013-07-03 | Bostik SA | Peelable adhesive composition |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2145244A1 (en) | 1996-09-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20150323 |