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Adhesive composition comprising amorphous propylene-ethylene copolymer and propylene polymer

a technology of amorphous propylene and propylene, which is applied in the direction of non-macromolecular adhesive additives, adhesives, adhesive additives, etc., can solve the problems of limited reactivity, poor bonding strength of amorphous olefins, and high cost of alpha-olefins

Active Publication Date: 2020-01-02
EASTMAN CHEM CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The copolymers exhibit a wide process window and high peel strength, enabling their use in hygiene applications with consistent adhesive performance across various conditions, while maintaining a desirable balance of physical properties.

Problems solved by technology

Unfortunately, C4-C10 alpha-olefins can be quite expensive due to market availability and can also exhibit limited reactivity during the polymerization processes.
Unfortunately, propylene-ethylene copolymers can exhibit deficiencies in hardness, thereby resulting in adhesives that lack ideal bond strength over time.
This can limit the application of these copolymers to certain types of adhesives due to the higher softening points.
Lower peel strength could lead to premature failure of the bond lines holding the various elements of the diaper construction, and subsequently expose the diaper user to the superabsorbent material.
Another concern related to low peel strength is the local bond failure that would lead, upon insult of the diaper, to the channeling of the body fluid with a resulting reduction of the overall protection of the diaper wearer.
Nevertheless, the attempts fell short of achieving the goal of producing a simple formulation that yields a wide process window simultaneously coupled with high peel strength.

Method used

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  • Adhesive composition comprising amorphous propylene-ethylene copolymer and propylene polymer
  • Adhesive composition comprising amorphous propylene-ethylene copolymer and propylene polymer
  • Adhesive composition comprising amorphous propylene-ethylene copolymer and propylene polymer

Examples

Experimental program
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example 1

[0158]In this example, various propylene-ethylene copolymers were produced in a two-liter stirred reactor with an average residence time of about one hour. The reactor temperature was maintained at approximately 140° C. and a pressure of 900 psig. The propylene was fed into the reactor as a liquid, while the ethylene was fed into the reactor as a gas. The polymerization occurred in the presence of a Ziegler-Natta catalyst, which was a titanium chloride on a magnesium chloride support. This particular catalyst is a heterogeneous-supported catalyst system formed from titanium compounds in combination with alkyl aluminum co-catalyst (“TEAL”). The catalyst system contained an Al / Ti mole ratio of 21. Any unreacted monomer and other vapors were vented from the reactor upon discharge of the copolymer.

[0159]Samples 1-11 were produced using the aforementioned catalyst system and an external electron donor. As noted below, the electron donor was either cyclohexylmethyldimethoxysilane (“C”) or...

example 2

[0165]In this example, various propylene-ethylene copolymers were produced using the process and system described in Example 1; however, the external electron donor used in this example was cyclohexylmethyldimethoxysilane. Furthermore, the amounts of electron donor added for each sample were varied as indicated by the donor / Ti molar ratio. The copolymers produced during this process are described in TABLE 2 below, along with their various properties and the reaction conditions used to produce them.

TABLE 2Copolymer Sample2A2B2C2D2E2F2GAl / Ti mole21212121212121ratioDonor / Ti,1.11.20.51.01.01.52.0mole ratioTEAL / Donor,31.329.670.032.932.924.716.5mole ratioHydrogen40202025252525(psig)Reactor140140140140140140140Temp, ° C.Reactor900900900900900900900Press.(psig)Catalyst843.91003.31006.81001.3957.2962.9904.1Activity(g / g)Visc. @3600660051754865726355384715190° C., cPSoftening140.3138.4145.3126.6135.9133129.6Point(° C.)Needle Pen.10141732242332(dmm)Wt. %10.010.010.015.013.015.015.0EthyleneFlow...

example 3

[0167]In this example, various propylene-ethylene copolymers were produced using the process and system described in Example 1. The external electron donor used in this example was dicyclopentyldimethoxysilane. Furthermore, the amounts of electron donor added for each sample was varied as indicated by the donor / Ti molar ratio. The copolymers produced during this process are described in TABLE 3 below, along with their various properties and the reaction conditions used to produce them

TABLE 3Copolymer SampleC1C23A3B3C3D3E3FAl / Ti mole2121212121212121ratioDonor / Ti,0.31.53.03.04.02.02.03.0mole ratioTEAL / Donor,71.015.87.07.05.210.410.47.0mole ratioHydrogen2025805050802550(psig)Reactor140140140140140140140140Temp, ° C.Reactor900900900900900900900900Press,(psig)Catalyst862.01037.1723.2793.4612.8880.6808.8630.1Activity(g / g)Visc. @761346251055315059631053164256250190° C., cPSoftening140.2143.2114.1109.997.4128.2136.4119.9Point(° C.)Needle Pen.2227374063212321(dmm)Wt. %10.015.015.017.517.513....

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Abstract

Amorphous propylene-ethylene copolymers are described herein that can include high amounts of ethylene and exhibit desirable softening points and needle penetrations. The desirable combinations of softening points and needle penetrations in these propylene-ethylene copolymers allow them to have a broad operating window. Due their broad operating window, the propylene-ethylene copolymers can be utilized in a wide array of applications and products, including hot melt adhesives.

Description

CROSS REFERENCES TO RELATED APPLICATIONS[0001]This is application claims priority to U.S. Provisional Ser. No. 62 / 517,251 filed on Jun. 9, 2017, and is a continuation-in-part application claiming priority to U.S. application Ser. No. 15 / 443,278 filed Feb. 27, 2017, which claims priority to U.S. application Ser. No. 14 / 567,028 filed Dec. 11, 2014 (now issued as U.S. Pat. No. 9,611,341), which claims priority to U.S. Provisional Application No. 61 / 937,024, and this application is also a continuation-in-part application claiming priority to U.S. application Ser. No. 15 / 638,964, which claims priority to U.S. Provisional Application No. 62 / 378,698; the disclosures of which are herein incorporated by reference in their entireties.BACKGROUND1. Field of the Invention[0002]The present invention is generally related to amorphous propylene-ethylene copolymers and processes for producing such copolymers. Particularly, the present invention is generally related to amorphous propylene-ethylene co...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08F210/06C08L53/02C09J11/06C08F10/06C08L23/10C09J123/10C08K5/01C09J123/14C08K5/134C08K11/00
CPCC08F210/16C08K11/00C08L23/10C08F10/06C08F210/06C08K5/134C09J123/10C08K5/01C09J123/14C09J11/06C08L53/02C08L53/025C08L2205/025C08L23/14C08F4/6465C08F4/6543C08F2500/04C08F2500/02C08F2500/17C08F2500/22C08L91/00
Inventor CARVAGNO, TERRI ROXANNEKUEPPERS, MICHELLE C.QUINN, THOMAS H.
Owner EASTMAN CHEM CO