IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
|
| 국제특허분류(IPC7판) |
|
| 출원번호 |
US-0761531
(2010-04-16)
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| 등록번호 |
US-8431643
(2013-04-30)
|
|
발명자
/ 주소 |
- Rodriguez, George
- Shipley, Fran A.
- Jiang, Peijun
- Sims, Charles L.
- Lewtas, Kenneth
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| 출원인 / 주소 |
- ExxonMobil Chemical Patents Inc.
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| 인용정보 |
피인용 횟수 :
1 인용 특허 :
45 |
초록
▼
The packaging industry desires adhesive compositions having a fast set time, such as those setting in less than five seconds from a molten state at conventional packaging operating temperatures to a solid or quasi solid having favorable Dot T-Peel, set time, and/or fiber tear adhesion properties. Po
The packaging industry desires adhesive compositions having a fast set time, such as those setting in less than five seconds from a molten state at conventional packaging operating temperatures to a solid or quasi solid having favorable Dot T-Peel, set time, and/or fiber tear adhesion properties. Polymer based adhesives performing within this window are a favorable alternative to conventional formulated adhesives. The provided adhesive compositions exhibit a favorable balance of properties such as high adhesive strength, wide temperature operating window, and fast set time. Provided are adhesive compositions composed of a polyolefin composition comprising at least about 50 mol % polypropylene, at least one wax and at least one wax modifier.
대표청구항
▼
1. An adhesive composition comprising: (i) a polyolefin polymer comprising a propylene content of at least 50 mol % wherein the polyolefin polymer has: (a) a heat of fusion from 2 to 120 J/g;(b) a weight average molecular weight (Mw) from 15,000 to 250,000;(c) a weight average molecular weight/numbe
1. An adhesive composition comprising: (i) a polyolefin polymer comprising a propylene content of at least 50 mol % wherein the polyolefin polymer has: (a) a heat of fusion from 2 to 120 J/g;(b) a weight average molecular weight (Mw) from 15,000 to 250,000;(c) a weight average molecular weight/number average molecular weight ratio (Mw/Mn) from about 1.8 to 10;(ii) at least one wax having a weight average molecular weight equal to or greater than about 3000, a viscosity at 140° C. from about 100 mPa·s to about 10,000 mPa·s and a wax softening point as defined by at least one of (A)-(D): (A) mettler drop point as determined by ASTM-D3954-94 greater than 110° C.;(B) congealing point as determined by ASTM D-938 greater than 110° C.;(C) ring and ball softening point as determined by ASTM E-28 is greater than 110° C.; or(D) peak melt temperature as determined by DSC is greater than 110° C.; and(iii) a wax modifier comprising a functionalized polyethylene and a maleated polypropylene. 2. The composition of claim 1, wherein said composition comprises a set time of less than about 4 seconds as measured by Dot Set Time. 3. The composition of claim 1, wherein the wax modifier comprises at least one functionalized polyethylene chosen from an ethylene vinyl acetate copolymer, ethylene acrylate acid copolymer, and ethylene-maleic anhydride copolymer. 4. The composition of claim 1, wherein the wax modifier comprises at least one functionalized polyethylene comprising a base polyethylene grafted with an unsaturated monomer chosen from an unsaturated carboxylic acid, an ester of an unsaturated carboxylic acid, an acid anhydride, a di-ester, a salt of an unsaturated carboxylic acid, an unsaturated amide, an unsaturated imide, an aromatic vinyl compound, a hydrolyzable unsaturated silane compound, and an unsaturated halogenated hydrocarbon. 5. The composition of claim 1, wherein the wax modifier comprises an ethylene vinyl acetate copolymer having a melt index (MI) of 550 g/10 minutes or higher, the EVA copolymer comprising from 10% to 50% by weight of vinyl acetate. 6. The composition of claim 1, wherein the wax modifier imparts a set time improvement of about 33% or more compared to a reference composition prepared with the same adhesive composition in the absence of a wax modifier. 7. The composition of claim 1, wherein the composition comprises from 0.01 wt % to 10 wt % of the wax modifier based on the total weight of the adhesive composition. 8. The composition of claim 1, wherein the polyolefin polymer has a melt index (MI) greater than 1 dg/min as measured by ASTM D1238(B). 9. The composition of claim 1, wherein the polyolefin polymer has a weight average molecular weight of 15,000 to 100,000, and either a branching index (g′) of from 0.7 to 0.98 measured at the z-average molecular weight of the polyolefin when the polyolefin polymer has an weight average molecular weight of 15,000 to 60,000, or a branching index (g′) of from 0.7 to 0.95 measured at the z-average molecular weight of the polyolefin when the polyolefin has an weight average molecular weight of 15,000 to 100,000. 10. The composition of claim 1, wherein the polyolefin polymer comprises at least 80 wt % of units derived from propylene and from about 1 to about 20 wt % of units derived from at least one C6 to C10 alpha-olefin, wherein the copolymer has a weight average molecular weight of less than 100,000 and a heat of fusion between about 10 and about 70 J/g. 11. The adhesive composition of claim 1, wherein fiber tear at −18° C. of about 10% or greater in comparison with said same adhesive composition in which the wax modifier is absent. 12. The adhesive composition of claim 1, wherein set time is equal to or less than 3 seconds when determined by the following equation: set time=5.26−6.9×10−5*[wax viscosity at 140° C.,(mPa·S)]−0.021*[wax softening point,(° C.)]. 13. A hot melt adhesive composition comprising: (i) a polyolefin polymer comprising a propylene content of at least 50 mol % wherein the polyolefin polymer has: (a) a heat of fusion from 2 to 120 J/g;(b) a weight average molecular weight (Mw) from 15,000 to 250,000;(c) a weight average molecular weight/number average molecular weight ratio (Mw/Mn) from about 1.8 to 10;(ii) at least one wax having a weight average molecular weight equal to or greater than about 3000, a viscosity at 140° C. (μwax) from about 100 mPa·s to about 10,000 mPa·s and a wax softening point (SPwax) as defined by at least one of (A)-(D): (A) mettler drop point as determined by ASTM-D3954-94 is greater than 110° C.;(B) congealing point as determined by ASTM D-938 is greater than 110° C.;(C) ring and ball softening point as determined by ASTM E-28 is greater than 110° C.; or(D) peak melt temperature as determined by DSC is greater than 110° C.; and(iii) at least one wax modifier comprising a functionalized polyethylene;wherein the hot melt adhesive has a set time is equal to or less than 3 seconds when determined by the following equation: set time=5.26−6.9×10−5*μwax−0.021*SPwax wherein μwax is the wax viscosity at 140° C. (mPa·s) and SPwax is the wax softening point (° C.) as defined by at least one of (A)-(D). 14. The hot melt adhesive composition of claim 13, wherein the wax modifier comprises at least one functionalized polyethylene chosen from an ethylene vinyl acetate copolymer, ethylene acrylate acid copolymer, and ethylene-maleic anhydride copolymer, and wherein the wax modifier further comprises maleated polypropylene. 15. The hot melt adhesive composition of claim 13, wherein the wax modifier comprises at least one functionalized polyethylene comprising a base polyethylene grafted with an unsaturated monomer chosen from an unsaturated carboxylic acid, an ester of an unsaturated carboxylic acid, an acid anhydride, a di-ester, a salt of an unsaturated carboxylic acid, an unsaturated amide, an unsaturated imide, an aromatic vinyl compound, a hydrolyzable unsaturated silane compound, and an unsaturated halogenated hydrocarbon. 16. A hot melt adhesive composition comprising: (i) a polyolefin polymer comprising a propylene content of at least 50 mol % wherein the polyolefin polymer has: (a) a heat of fusion from 2 to 120 J/g;(b) a weight average molecular weight (Mw) from 15,000 to 250,000;(c) a weight average molecular weight/number average molecular weight ratio (Mw/Mn) from about 1.8 to 10;(ii) at least one wax having a weight average molecular weight equal to or greater than about 3000, a viscosity at 140° C. (μwax) from about 100 mPa·s to about 10,000 mPa·s and a wax softening point (SPwax) as defined by at least one of (A)-(D): (A) mettler drop point as determined by ASTM-D3954-94 is greater than 110° C.;(B) congealing point as determined by ASTM D-938 is greater than 110° C.;(C) ring and ball softening point as determined by ASTM E-28 is greater than 110° C.; or(D) peak melt temperature as determined by DSC is greater than 110° C.; and(iii) at least one wax modifier comprising an ethylene vinyl acetate copolymer and a maleated polypropylene, wherein the ethylene vinyl acetate copolymer has a melt index (MI) of 550 g/10 minutes or higher, the EVA copolymer comprising from 15% to 45% by weight of vinyl acetate;wherein the hot melt adhesive has a set time is equal to or less than 3 seconds when determined by the following equation: set time=5.26−6.9×10−5*μwax−0.021*SPwax wherein μwax is the wax viscosity at 140° C. (mPa·s) and SPwax is the wax softening point (° C.) as defined by at least one of (A)-(D). 17. The composition of claim 1, wherein the polyolefin polymer has a heat of fusion between about 80 and about 120 J/g. 18. The composition of claim 16, wherein the polyolefin polymer has a heat of fusion between about 80 and about 120 J/g.
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