IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0472022
(2009-05-26)
|
등록번호 |
US-8431642
(2013-04-30)
|
발명자
/ 주소 |
- Tancrede, Jean M.
- Curry, Christopher L.
- Johnsrud, David R.
- Rodriguez, George
- Shipley, Fran A.
|
출원인 / 주소 |
- Exxonmobil Chemical Patents Inc.
|
인용정보 |
피인용 횟수 :
7 인용 특허 :
46 |
초록
▼
Provided are adhesive compositions composed of a polyolefin composition comprising at least about 50 wt. % polypropylene and at least one wax. The polymer compositions have a Dot T-Peel of about 1 Newton or more, a branching index (g′) of 0.95 or less measured at the Mz of the polymer, a molecular w
Provided are adhesive compositions composed of a polyolefin composition comprising at least about 50 wt. % polypropylene and at least one wax. The polymer compositions have a Dot T-Peel of about 1 Newton or more, a branching index (g′) of 0.95 or less measured at the Mz of the polymer, a molecular weight of 100,000 or less, and the adhesive compositions has a fast set time. 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.
대표청구항
▼
1. An adhesive composition comprising: (1) a polyolefin composition comprising at least about 50 mol % of a polypropylene, and(2) at least one wax, wherein the at least one wax comprises a linear polyethylene wax having a molecular weight equal to or greater than 3000; and(3) wherein the adhesive co
1. An adhesive composition comprising: (1) a polyolefin composition comprising at least about 50 mol % of a polypropylene, and(2) at least one wax, wherein the at least one wax comprises a linear polyethylene wax having a molecular weight equal to or greater than 3000; and(3) wherein the adhesive composition is free of tackifier;(A) wherein the polyolefin composition has: (a) a Dot T-Peel of 1 Newton or more on Kraft paper,(b) an Mw of 10,000 to 100,000,(c) a branching index (g′) of from 0.4 to 0.98 measured at the Mz of the polyolefin when the polyolefin has an Mw of 10,000 to 60,000, or a branching index (g′) of from 0.4 to 0.95 measured at the Mz of the polyolefin when the polyolefin has an Mw of 10,000 to 100,000;(B) wherein the at least one wax has a viscosity at 140° C. of between about 100 cp and about 10,000 cp and a wax softening point greater than 110° C. such that a set time function F is greater than 1 and less than 3, wherein F is calculated according to the following equation: F=5.26−6.9×10−5*[wax viscosity at 140° C., (cp)]−0.021*[wax softening point, (° C.)]wherein the wax softening point is determined by at least one of:(a) mettler drop point as determined by ASTM-D3954-94;(b) congealing point as determined by ASTM D-938;(c) ring and ball softening point as determined by ASTM E-28; or(d) peak melt temperature as determined by DSC; and(C) wherein the adhesive composition has a set time greater than about 1 second and less than about 3 seconds as measured by Dot Set Time; and(D) wherein the adhesive composition has a fiber tear at 2° C. of about 20% or greater. 2. The adhesive composition of claim 1, wherein the set time is from about 1.5 seconds to about 3 seconds as measured by Dot Set Time. 3. The adhesive composition of claim 1, wherein the set time is from about 1.5 seconds to about 2.5 seconds as measured by Dot Set Time. 4. The adhesive composition of claim 1, wherein the linear polyethylene wax has a viscosity greater than about 100 cp at 190° C. 5. The adhesive composition of claim 1, wherein the linear polyethylene wax has a peak melt point greater than about 110° C. 6. The adhesive composition of claim 1, wherein the linear polyethylene wax comprising polyethylene imparts a set time improvement of about 33% or more compared to a reference composition prepared with the same polymer compositions and a Fischer Tropsch wax having a congealing point per ASTM D-938 of 80° C. 7. The adhesive composition of claim 1, wherein the adhesive composition has a fiber tear at 2° C. of about 20% or greater. 8. An adhesive composition, comprising: (1) a polyolefin composition comprising at least about 50 mol % of a polypropylene,(2) at least one wax, wherein the at least one wax comprises a linear polyethylene wax having a molecular weight equal to or greater than 3000, a viscosity at 140° C. of between about 100 cp and about 10,000 cp, and a viscosity greater than about 100 cp at 190° C.; and(3) wherein the adhesive composition is free of tackifier;(A) wherein the polyolefin composition has: (a) a Dot T-Peel of 1 Newton or more on Kraft paper,(b) an Mw of 10,000 to 100,000,(c) a branching index (g′) of from 0.4 to 0.98 measured at the Mz of the polyolefin when the polyolefin has an Mw of 10,000 to 60,000, or a branching index (g′) of from 0.4 to 0.95 measured at the Mz of the polyolefin when the polyolefin has an Mw of 10,000 to 100,000;(B) wherein the at least one wax has a wax softening point greater than 110° C. such that a set time function F is greater than 1 and less than 3, wherein F is calculated according to the following equation: F=5.26−6.9×10−5*[wax viscosity at 140° C., (cp)]−0.021*[wax softening point, (° C.)]wherein the wax softening point is determined by at least one of:(a) mettler drop point as determined by ASTM-D3954-94;(b) congealing point as determined by ASTM D-938;(c) ring and ball softening point as determined by ASTM E-28; or(d) peak melt temperature as determined by DSC;(C) wherein the adhesive composition has a set time greater than about 1 second and less than about 3 seconds as measured by Dot Set Time; and(D) wherein the adhesive composition has a fiber tear at 2° C. of about 20% or greater.
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