US4615914A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of the interior surfaces of resinous enclosure members
Assignee: Dow Chemical Co
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Filing: 1985-10-07
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Granted: 1986-10-07
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Expires: 2005-10-07
Abstract
Abstract Plastic containers are treated to provide increased barrier properties to organics and gases such as oxygen by treating the interior surface of the container with SO 3 gas. The SO 3 gas is provided by inserting a solid pellet of poly-SO 3 into the container and evaporating the SO 3 such as with microwave energy. A solid neutralizing agent such as ammonium carbonate is then placed into the container and evaporated with microwave energy to form ammonia which neutralizes the sulfonic acid groups on the surface interior of the container.
Inventors
- 👤 Wilhelm E. Walles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:09
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/34; C08F8/36; C08J; C08J7/00; C08J7/12; C08J7/14; C08F8/40
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
122 words
An improvement in the method of sulfonating the interior surface of an enclosure member formed of a resinous organic polymer which is capable of being surface sulfonated when contacted with SO 3 vapors wherein the interior surface is contacted with a sufficient quantity of gaseous SO 3 to thereby form sulfonic acid groups along the backbone of the resinous organic polymer, the improvement which comprises: introducing into the interior of the enclosure member a solid particulate form of a sulfur trioxide and heating said solid material to form a sufficient quantity of sulfur trioxide gas to react with at least a portion of the interior surface of said enclosure member thereby forming said sulfonic acid groups attached to the resinous organic polymer.
Claim 2
Dependent Claim
122 words
An improvement in the method of sulfonating the interior surface of an enclosure member formed of a resinous organic polymer which is capable of being surface sulfonated when contacted with SO 3 vapors wherein the interior surface is contacted with a sufficient quantity of gaseous SO 3 to thereby form sulfonic acid groups along the backbone of the resinous organic polymer, the improvement which comprises: introducing into the interior of the enclosure member a solid particulate form of a sulfur trioxide and heating said solid material to form a sufficient quantity of sulfur trioxide gas to react with at least a portion of the interior surface of said enclosure member thereby forming said sulfonic acid groups attached to the resinous organic polymer.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein subsequent to said sulfonating step the sulfonic acid groups are neutralized.
Claim 4
Dependent Claim
14 words
The method of claim 2 wherein the sulfonic acid groups are neutralized with ammonia.
Claim 5
Dependent Claim
14 words
The method of claim 1 wherein the sulfonic acid groups are neutralized with ammonia.
Claim 6
Dependent Claim
55 words
The method of claim 1 wherein subsequent to the formation of the sulfonic acid groups a solid material, which upon heating forms a gas which is capable of neutralizing the sulfonic acid groups, is introduced into the interior of the enclosure member and subsequently heated to form a gas which neutralizes the sulfonic acid groups.
Claim 7
Dependent Claim
20 words
The method of claim 5 wherein the solid neutralizing material is an ammonium compound which upon heating forms ammonia vapors.
Claim 8
Independent Claim
19 words
The method of claims 1, 2, 3, 4, 5 or 6 wherein heating is accomplished with radio frequency waves.
Claim 9
Dependent Claim
110 words
An improvement in the method of sulfonating the interior surface of an enclosure member formed of a resinous organic polymer which is capable of being surface sulfonated when contacted with SO 3 vapors wherein the interior surface is contacted with a sufficient quantity of gaseous SO 3 to thereby form sulfonic acid groups along the backbone of the resinous polymer and neutralizing sulfonic acid groups, the improvement which comprises: introducing a solid material, which upon heating forms a gas which is capable of neutralizing the sulfonic acid groups, into the interior of the sulfonated enclosure member and heating the solid material to form a gas which neutralizes the sulfonic groups.
Claim 10
Dependent Claim
110 words
An improvement in the method of sulfonating the interior surface of an enclosure member formed of a resinous organic polymer which is capable of being surface sulfonated when contacted with SO 3 vapors wherein the interior surface is contacted with a sufficient quantity of gaseous SO 3 to thereby form sulfonic acid groups along the backbone of the resinous polymer and neutralizing sulfonic acid groups, the improvement which comprises: introducing a solid material, which upon heating forms a gas which is capable of neutralizing the sulfonic acid groups, into the interior of the sulfonated enclosure member and heating the solid material to form a gas which neutralizes the sulfonic groups.
Claim 11
Dependent Claim
19 words
The method of claim 8, wherein the solid material is an ammonium compound which upon heating forms ammonia vapors.
Claim 12
Independent Claim
16 words
The method of claims 8 or 9, wherein the heating is accomplished by radio frequency waves.
References Cited (Backward Citations)
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US3940377A
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US3770706A
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US4425460A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-06 | 1990-04-07 | 1990-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-06 | 1994-04-07 | 1994-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-06 | 1998-04-07 | 1998-10-07 | $7700.00 | Window Closed / Lapsed |