Polypropylene-based adhesive compositions
First Claim
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1. A process of producing an adhesive composition comprising:
- a) reacting propylene and at least one comonomer selected from the group consisting of ethylene and C4 to C20 α
-olefins, under polymerization conditions in the presence of a metallocene catalyst capable of incorporating the propylene into isotactic or syndiotactic sequences, in a first reactor to produce a first copolymer having at least 65 mole % propylene; and
b) reacting propylene and at least one comonomer selected from the group consisting of ethylene and C4 to C20 α
-olefins, under polymerization conditions in the presence of a metallocene catalyst capable of incorporating the propylene into isotactic or syndiotactic sequences, in another reactor or subsequent reactors, to produce a second copolymer having at least 65 mol % propylene;
c) combining the contents of the first reactor with the contents of the subsequent reactors to form a blend, and;
d) adding a tackifier at any time during the process;
wherein the first copolymer has a melting point of 25 to 120°
C., a melt index (MI) from about 78 dg/min to about 3000 dg/min according to ASTM D 1238 (B) at 190°
C., and wherein the MFR, as measured according to ASTM D 1238 at 230°
C., of the first copolymer is greater than 250 dg/min.
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Abstract
An adhesive blend is described that can include a semi-crystalline copolymer of propylene and at least one comonomer selected from the group consisting of ethylene and at least one C4 to C20 α-olefin, the copolymer having a weight average molecular weight (Mw) from about 15,000 to about 200,000; an melt index (MI) from about 7 dg/min to about 3000 dg/min as measured by ASTM D 1238(B), and a (Mw/Mn) of approximately 2. Various production processes are also described. Also described are adhesive compositions and methods for making adhesive compositions having polymers or polymer blends with melt flow rates (MFRs) equal to and above 250 dg/min. at 230° C. Certain specific embodiments of the invention involve the use of a free radical initiator, e.g., a peroxide.
99 Citations
11 Claims
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1. A process of producing an adhesive composition comprising:
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a) reacting propylene and at least one comonomer selected from the group consisting of ethylene and C4 to C20 α
-olefins, under polymerization conditions in the presence of a metallocene catalyst capable of incorporating the propylene into isotactic or syndiotactic sequences, in a first reactor to produce a first copolymer having at least 65 mole % propylene; andb) reacting propylene and at least one comonomer selected from the group consisting of ethylene and C4 to C20 α
-olefins, under polymerization conditions in the presence of a metallocene catalyst capable of incorporating the propylene into isotactic or syndiotactic sequences, in another reactor or subsequent reactors, to produce a second copolymer having at least 65 mol % propylene;c) combining the contents of the first reactor with the contents of the subsequent reactors to form a blend, and; d) adding a tackifier at any time during the process; wherein the first copolymer has a melting point of 25 to 120°
C., a melt index (MI) from about 78 dg/min to about 3000 dg/min according to ASTM D 1238 (B) at 190°
C., and wherein the MFR, as measured according to ASTM D 1238 at 230°
C., of the first copolymer is greater than 250 dg/min.- View Dependent Claims (2, 3, 4, 5, 6, 10, 11)
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7. A process of producing an adhesive composition comprising:
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a) reacting propylene and at least one comonomer selected from the group consisting of ethylene and C4 to C20 α
-olefins, under polymerization conditions in the presence of a metallocene catalyst capable of incorporating the propylene into isotactic or syndiotactic sequences, in a first reactor to produce a first copolymer having at least 65 mole % propylene and wherein at least 40% of the propylene pentad sequences are in isotactic or syndiotactic orientations; andb) reacting propylene and at least one comonomer selected from the group consisting of ethylene and C4 to C20 α
-olefins, under polymerization conditions in the presence of a metallocene catalyst capable of incorporating the propylene into isotactic or syndiotactic sequences, in another reactor or subsequent reactors, to produce a second copolymer having at least 65 mol % propylene;c) combining the contents of the first reactor with the contents of the subsequent reactors to form a blend, and; d) adding a tackifier at any time during the process; wherein the first copolymer has a melt index (MI) from about 78 dg/min to about 3000 dg/min according to ASTM D 1238 (B) at 190°
C., and wherein the MFR, as measured according to ASTM D 1238 at 230°
C., of the first copolymer is greater than 250 dg/min.- View Dependent Claims (8, 9)
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Specification
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Current AssigneeExxonMobil Chemical Patents Inc. (Exxon Mobil Corporation)
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Original AssigneeExxonMobil Chemical Patents Inc. (Exxon Mobil Corporation)
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InventorsKarandinos, Anthony G., Nelson, Keith A., Tancrede, Jean M., Georjon, Olivier J. F., Lohse, David J., Harrington, Bruce A., Datta, Sudhin, Lewtas, Kenneth, Cozewith, Charles
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Primary Examiner(s)RABAGO, ROBERTO
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Application NumberUS10/720,512Publication NumberTime in Patent Office1,975 DaysField of Search526/65, 526/160, 526/348, 526/170, 526/348.2, 525/53, 525/240US Class Current525/53CPC Class CodesC08F 210/06 PropeneC08F 210/14 Monomers containing five or...C08F 210/16 Copolymers of ethene with a...C08F 2500/03 Narrow molecular weight dis...C08F 2500/12 Melt flow index or melt flo...C08F 2500/17 ViscosityC08L 2205/02 containing two or more poly...C08L 23/10 Homopolymers or copolymers ...C08L 2314/06 Metallocene or single site ...C08L 2666/02 Organic macromolecular comp...C08L 2666/04 Macromolecular compounds ac...C09J 123/10 Homopolymers or copolymers ...C09J 123/14 Copolymers of propene C09J1...
