US4705612A
Expired / Lapsed
US
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Method for plasma-initiated polymerization
Assignee: Terumo Corp
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Filing: 1986-02-06
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Granted: 1987-11-10
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Expires: 2006-02-06
Abstract
Abstract In a method for plasma-initiated polymerization by the steps of exposing a vapor phase containing monomer vapor to a plasma and introducing a polymerization initiating active seed consequently produced into a condensate phase of monomer thereby effecting chain-growth polymerization of the monomer, the improvement which comprises effecting the production of the polymer while keeping a radical polymerization initiator present at least in the aforementioned vapor phase.
Inventors
- 👤 Takeshi Shimomura
- 👤 Tohru Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:28
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/46; C08F2/52
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
65 words
A method for plasma-initiated polymerization by the steps of exposing a vapor phase containing monomer vapor to a plasma and introducing a polymerization initiating active seed consequently produced into a condensate phase of monomer thereby effecting chain-growth polymerization of said monomer, which method is characterized by effecting the production of a polymer while keeping a radical polymerization initiator present at least in said vapor phase.
Claim 2
Independent Claim
65 words
A method for plasma-initiated polymerization by the steps of exposing a vapor phase containing monomer vapor to a plasma and introducing a polymerization initiating active seed consequently produced into a condensate phase of monomer thereby effecting chain-growth polymerization of said monomer, which method is characterized by effecting the production of a polymer while keeping a radical polymerization initiator present at least in said vapor phase.
Claim 3
Dependent Claim
26 words
A method according to claim 1, wherein said radical polymerization initiator is present in both said vapor phase of monomer and said condensate phase of monomer.
Claim 4
Dependent Claim
18 words
A method according to claim 1, wherein said monomer is a methacrylate type or acrylate type vinyl monomer.
Claim 5
Dependent Claim
22 words
A method according to claim 1, wherein said radical polymerization initiator is selected from the group consisting of peroxides and azo compounds.
Claim 6
Dependent Claim
53 words
A method according to claim 1, wherein said monomer vapor existing during the course of said exposure to said plasma is released from the system after completion of said exposure to plasma and thereafter fresh monomer is sealed in the vessel used said exposure to plasma and allowed to undergo chain-growth polymerization therein.
Claim 7
Dependent Claim
37 words
A method according to claim 1, wherein said polymerization initiating active seed has been produced in a theoretical amount so that said chain-growth reaction of monomer will be stopped at a desired polymerization degree of the polymer.
Claim 8
Dependent Claim
33 words
A method according to claim 1, wherein said radical polymerization initiator is active at low temperatures and said chain-growth polymerization is effected at low temperatures in the range of 20° to -20° C.
Claim 9
Dependent Claim
29 words
A method according to claim 7, wherein said low-temperature active radical polymerization initiator has a half life of 10 hours at a temperature of not more than 60° C.
Claim 10
Dependent Claim
18 words
A method according to claim 7, wherein said monomer is a methacrylate type or acrylate type vinyl monomer.
Claim 11
Dependent Claim
24 words
A method according to claim 7, wherein said low-temperature active radical polymerization initiator is selected from the group consisting to peroxides and azo compounds.
Claim 12
Dependent Claim
16 words
A method according to claim 10, wherein said low-temperature active radical polymerization initiator is diisopropylperoxy neodecanoate.
Claim 13
Dependent Claim
21 words
A method according to claim 1, wherein said chain-growth polymerization of monomer is carried out in the present of an alcohol.
Claim 14
Dependent Claim
18 words
A method according to claim 12, wherein said monomer is a methacrylate type or acrylate type vinyl monomer.
Claim 15
Dependent Claim
13 words
A method according to claim 12, wherein said alcohol is a lower alcohol.
Claim 16
Dependent Claim
27 words
A method according to claim 14, wherein said lower alcohol is selected from the group consisting of methanol, ethanol, n-propanol, isopropanol, n-butanol, sec-butanol, tert-butanol, and mixtures thereof.
Claim 17
Dependent Claim
22 words
A method according to claim 12, wherein said radical polymerization initiator is selected from the group consisting of peroxides and azo compounds.
Claim 18
Dependent Claim
29 words
A method according to claim 12, wherein said condensate phase of monomer is separated from said vapor phase of monomer during the course of said exposure to said plasma.
Claim 19
Independent Claim
91 words
A method for producing a polymer by plasma-initiated polymerization wherein the polymer is of a molecular weight of at least about 10 7 , comprising the steps of exposing a vapor phase containing monomer vapor to a plasma and introducing a polymerization initiating active seed consequently produced into a condensate phase of monomer thereby effecting chain-growth polymerization of said monomer, which method is characterized by effecting the production of polymer while keeping a radical polymerization initiator present at least in said vapor phase, wherein said initiator is benzoyl peroxide or azo-bis-isobutyronitrile.
Claim 20
Independent Claim
91 words
A method for producing a polymer by plasma-initiated polymerization wherein the polymer is of a molecular weight of at least about 10 7 , comprising the steps of exposing a vapor phase containing monomer vapor to a plasma and introducing a polymerization initiating active seed consequently produced into a condensate phase of monomer thereby effecting chain-growth polymerization of said monomer, which method is characterized by effecting the production of polymer while keeping a radical polymerization initiator present at least in said vapor phase, wherein said initiator is benzoyl peroxide or azo-bis-isobutyronitrile.
Claim 21
Dependent Claim
24 words
The method according to claim 18, wherein said radical polymerization initiator is benzoyl peroxide in the concentration of 4×10 -5 to 2×10 -2 mole/liter.
Claim 22
Dependent Claim
23 words
The method according to claim 18, wherein said radical polymerization initiator is azo-bis-isobutylonitrile in the concentration of 6×10 -4 to 3×10 -2 mole/liter.
Claim 23
Dependent Claim
22 words
The method according to claim 18, wherein the molecular weight of the polymer is about 1×10 7 to about 1.9×10 7 .
References Cited (Backward Citations)
US4212719A
Cited
EP0095974A1
Cited
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| 3.5 Years (Year 4) | 1990-11-09 | 1991-05-11 | 1991-11-10 | $2000.00 | Window Closed / Lapsed |
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