US4251407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polypropylene compositions
Assignee: Union Carbide Chemicals and Plastics Technology LLC
•
Filing: 1978-09-01
•
Granted: 1981-02-17
•
Expires: 1998-09-01
Abstract
Abstract Polypropylene which contains residues of Ziegler catalysts, and especially crystalline polypropylene which contains significant amounts of low molecular weight or atactic polymer, is improved by addition of a very low concentration of finely divided zinc oxide. Such zinc oxide not only acts as acid acceptor, making it possible to omit the conventional calcium stearate acid acceptor, but also interferes with migration of atactic and low molecular weight polymer to the surface, thus preventing plate-out of such material on processing equipment. In the thermal processing of polyproplene compositions containing metal stearate as acid acceptor or organic stearates as antistatic additives, the presence of such zinc oxide in the composition prevents plate-out on processing equipment and improves corrosivity of the compositions; it does not eliminate the antistatic effect.
Inventors
- 👤 Carl W. Schroeder
- 👤 Joseph R. Webster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:23
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
116 words
Improved polypropylene composition comprising essentially a substrate of polypropylene containing a high proportion of stereoregular propylene polymer which is insoluble in xylene at ambient temperature and containing at least one of (i) a corrosion-causing amount up to about 100 ppm of chlorine present as residue of a Ziegler type polymerization catalyst, (ii) at least 3% of xylene-soluble propylene polymer; and (iii) an amount of salt or ester of long chain fatty acid which results in plate-out during thermal processing of said substrate, said composition being conventionally stabilized against degradation under the influence of heat, and containing from 0.005 to 0.05 percent by weight of zinc oxide having a mean particle size no greater than 0.3 micron.
Claim 2
Dependent Claim
116 words
Improved polypropylene composition comprising essentially a substrate of polypropylene containing a high proportion of stereoregular propylene polymer which is insoluble in xylene at ambient temperature and containing at least one of (i) a corrosion-causing amount up to about 100 ppm of chlorine present as residue of a Ziegler type polymerization catalyst, (ii) at least 3% of xylene-soluble propylene polymer; and (iii) an amount of salt or ester of long chain fatty acid which results in plate-out during thermal processing of said substrate, said composition being conventionally stabilized against degradation under the influence of heat, and containing from 0.005 to 0.05 percent by weight of zinc oxide having a mean particle size no greater than 0.3 micron.
Claim 3
Dependent Claim
13 words
A composition according to claim 1, containing a conventional stabilizer against actinic radiation.
Claim 4
Dependent Claim
69 words
Improved polypropylene composition consisting essentially of polypropylene prepared with a Ziegler type catalyst, containing a high proportion of stereoregular propylene polymer which is insoluble in xylene at ambient temperature and at least 3% by weight of xylene-soluble propylene polymer, conventional stabilizer against degradation under the influence of heat, and from 0.005 to 0.05% by weight of zinc oxide having a mean particle size no greater than about 0.3 micron.
Claim 5
Dependent Claim
69 words
Improved polypropylene composition consisting essentially of polypropylene prepared with a Ziegler type catalyst, containing a high proportion of stereoregular propylene polymer which is insoluble in xylene at ambient temperature and at least 3% by weight of xylene-soluble propylene polymer, conventional stabilizer against degradation under the influence of heat, and from 0.005 to 0.05% by weight of zinc oxide having a mean particle size no greater than about 0.3 micron.
Claim 6
Dependent Claim
19 words
A composition according to claim 1 wherein the mean particle size of said zinc oxide is about 0.11 micron.
Claim 7
Dependent Claim
69 words
Improved polypropylene composition consisting essentially of isotactic polypropylene prepared with a Ziegler type catalyst, containing a corrosion-causing amount up to about 100 ppm of chlorine present as catalyst residue, at least 3% by weight of xylene-soluble propylene polymer and conventional stabilizer against degradation under the influence of heat, and from 0.005 to 0.05% by weight of zinc oxide having a mean particle size no greater than about 0.3 micron.
Claim 8
Dependent Claim
69 words
Improved polypropylene composition consisting essentially of isotactic polypropylene prepared with a Ziegler type catalyst, containing a corrosion-causing amount up to about 100 ppm of chlorine present as catalyst residue, at least 3% by weight of xylene-soluble propylene polymer and conventional stabilizer against degradation under the influence of heat, and from 0.005 to 0.05% by weight of zinc oxide having a mean particle size no greater than about 0.3 micron.
Claim 9
Dependent Claim
19 words
A composition according to claim 5 wherein the mean particle size of said zinc oxide is about 0.11 micron.
Claim 10
Dependent Claim
84 words
Improved polypropylene composition consisting essentially of a substrate of polypropylene prepared with a Ziegler type catalyst, said substrate containing a corrosion-causing amount up to about 100 ppm of chlorine present as catalyst residue, conventional stabilizer against degradation under the influence of heat, an amount of salt or ester of long chain fatty acid which results in plate-out during thermal processing of said substrate, and from 0.005 to 0.05% by weight of zinc oxide having a mean particle size no greater than about 0.3 micron.
Claim 11
Dependent Claim
84 words
Improved polypropylene composition consisting essentially of a substrate of polypropylene prepared with a Ziegler type catalyst, said substrate containing a corrosion-causing amount up to about 100 ppm of chlorine present as catalyst residue, conventional stabilizer against degradation under the influence of heat, an amount of salt or ester of long chain fatty acid which results in plate-out during thermal processing of said substrate, and from 0.005 to 0.05% by weight of zinc oxide having a mean particle size no greater than about 0.3 micron.
Claim 12
Dependent Claim
12 words
A composition according to claim 7 wherein said salt is calcium stearate.
Claim 13
Dependent Claim
19 words
A composition according to claim 7 wherein said ester is an ester of stearic acid which imparts antistatic properties.
Claim 14
Dependent Claim
19 words
A composition according to claim 7 wherein the mean particle size of said zinc oxide is about 0.11 micron.
Claim 15
Dependent Claim
110 words
Improved polypropylene composition consisting essentially of a substrate of polypropylene prepared with a Ziegler type catalyst, said substrate containing a high proportion of stereoregular propylene polymer which is insoluble in xylene at ambient temperature and a corrosion-causing amount up to about 100 ppm of chlorine present as catalyst residue and at least 3% by weight of xylene-soluble propylene polymer, conventional stabilizer against degradation under the influence of heat, an amount of salt or ester of long chain fatty acid which results in plate-out during thermal processing of said substrate, and from 0.005 to 0.05% by weight of zinc oxide having a mean particle size no greater than about 0.3 micron.
Claim 16
Dependent Claim
110 words
Improved polypropylene composition consisting essentially of a substrate of polypropylene prepared with a Ziegler type catalyst, said substrate containing a high proportion of stereoregular propylene polymer which is insoluble in xylene at ambient temperature and a corrosion-causing amount up to about 100 ppm of chlorine present as catalyst residue and at least 3% by weight of xylene-soluble propylene polymer, conventional stabilizer against degradation under the influence of heat, an amount of salt or ester of long chain fatty acid which results in plate-out during thermal processing of said substrate, and from 0.005 to 0.05% by weight of zinc oxide having a mean particle size no greater than about 0.3 micron.
Claim 17
Dependent Claim
12 words
A composition according to claim 11 wherein said salt is calcium stearate.
Claim 18
Dependent Claim
19 words
A composition according to claim 11 wherein said ester is an ester of stearic acid which imparts antistatic properties.
Claim 19
Dependent Claim
19 words
A composition according to claim 11 wherein the mean particle size of said zinc oxide is about 0.11 micron.
Claim 20
Independent Claim
119 words
The method of stabilizing against causing corrosion of processing equipment and against plate-out of lower molecular weight components in thermal processing, a polypropylene composition containing a high proportion of stereoregular propylene polymer which is insoluble in xylene at ambient temperature and a corrosion-causing amount up to about 100 ppm of chlorine present as residue of a Ziegler type polymerization catalyst and at least about 3% by weight atactic or lower molecular weight propylene polymer soluble in xylene at 25° C., said composition being conventionally stabilized against degradation under the influence of heat, which comprises incorporating in said composition from 0.005 to 0.05 percent by weight of zinc oxide having a mean particle size no greater than about 0.3 micron.
Claim 21
Independent Claim
119 words
The method of stabilizing against causing corrosion of processing equipment and against plate-out of lower molecular weight components in thermal processing, a polypropylene composition containing a high proportion of stereoregular propylene polymer which is insoluble in xylene at ambient temperature and a corrosion-causing amount up to about 100 ppm of chlorine present as residue of a Ziegler type polymerization catalyst and at least about 3% by weight atactic or lower molecular weight propylene polymer soluble in xylene at 25° C., said composition being conventionally stabilized against degradation under the influence of heat, which comprises incorporating in said composition from 0.005 to 0.05 percent by weight of zinc oxide having a mean particle size no greater than about 0.3 micron.
Claim 22
Dependent Claim
18 words
The method according to claim 15 wherein the particle size of said zinc oxide is about 0.11 micron.
Claim 23
Dependent Claim
19 words
The method according to claim 15 wherein said composition contains up to 1% of at least one stearate compound.
Claim 24
Independent Claim
108 words
The method of preventing corrosion of processing equipment and plate-out of lower molecular weight components in the thermal processing of polypropylene compositions containing a high proportion of stereoregular propylene polymer which is insoluble in xylene at ambient temperature and a corrosion-causing amount up to about 100 ppm chlorine, present as residue of a Ziegler type polymerization catalyst, and at least about 3% by weight xylene-soluble propylene polymer, conventionally stabilized against degradation under the influence of heat, which comprises incorporating in the polypropylene composition, prior to said thermal processing, from 0.005 to 0.05% by weight of zinc oxide having a mean particle size no greater than about 0.3 micron.
Claim 25
Independent Claim
108 words
The method of preventing corrosion of processing equipment and plate-out of lower molecular weight components in the thermal processing of polypropylene compositions containing a high proportion of stereoregular propylene polymer which is insoluble in xylene at ambient temperature and a corrosion-causing amount up to about 100 ppm chlorine, present as residue of a Ziegler type polymerization catalyst, and at least about 3% by weight xylene-soluble propylene polymer, conventionally stabilized against degradation under the influence of heat, which comprises incorporating in the polypropylene composition, prior to said thermal processing, from 0.005 to 0.05% by weight of zinc oxide having a mean particle size no greater than about 0.3 micron.
Claim 26
Dependent Claim
18 words
The method according to claim 18 wherein the particle size of said zinc oxide is about 0.11 micron.
Claim 27
Dependent Claim
20 words
The method according to claim 18 wherein said composition contains up to about 1% of at least one stearate compound.
Claim 28
Dependent Claim
45 words
A composition according to claim 1 wherein the mean particle size of said zinc oxide is about 0.11 micron and its concentration is selected in the range from 0.005 to 0.03 percent to be below that which adversely affects the optical properties of the composition.
References Cited (Backward Citations)
GB819277A
Cited
US3111499A
Cited
US3462389A
Cited
US3238163A
Cited
US3376250A
Cited
US3745142A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-17 | 1984-08-18 | 1985-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-17 | 1988-08-18 | 1989-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-17 | 1992-08-18 | 1993-02-17 | $7700.00 | Window Closed / Lapsed |