US3899455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing lightweight concrete
Assignee: BASF Corp
•
Filing: 1974-04-18
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Granted: 1975-08-12
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Expires: 1994-04-18
Abstract
Abstract The adhesion of foamed particles, e.g., foamed polystyrene beads, in a lightweight concrete composition is improved by surface coating the foamed particles prior to incorporation into the lightweight concrete mixture with a phenol containing (1) coal tar or (2) anthracene oil and cross-linkable phenolic resin blend.
Inventors
- 👤 Leo Unterstenhoefer
- 👤 Wilhelm Krieger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:33
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/22; C08J9/224; C04; C04B; C04B20/00; C04B20/10; C04B20/1018; C08J2325/00; C08J2325/02; C08J2325/04; C08J2325/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
68 words
IN A METHOD OF PREPARING LIGHTWEIGHT CONCRETE COMPOSITIONS CONTAINING HYDRAULIC BINDER, WATER AND CLOSED CELL FORMED POLYSTYRENE PARTICLES THE IMPROVEMENT OF INCREASING THE ADHESION OF THE FOAMED PARTICLES TO THE CURED OR SET CONCRETE COMPOSITION COMPRISING SURFACE COATING THE CLOSED CELL FOAMED PARTICLES PRIOR TO THEIR INCORPORATION INTO THE LIGHTWEIGHT CONCRETE MIXTURE WITH A PHENOL CONTAINING (1) COAL TAR OR (2) ANTHRACENE OIL AND CROSS-LINKABLE PHENOLIC RESIN BLEND.
Claim 2
Dependent Claim
68 words
IN A METHOD OF PREPARING LIGHTWEIGHT CONCRETE COMPOSITIONS CONTAINING HYDRAULIC BINDER, WATER AND CLOSED CELL FORMED POLYSTYRENE PARTICLES THE IMPROVEMENT OF INCREASING THE ADHESION OF THE FOAMED PARTICLES TO THE CURED OR SET CONCRETE COMPOSITION COMPRISING SURFACE COATING THE CLOSED CELL FOAMED PARTICLES PRIOR TO THEIR INCORPORATION INTO THE LIGHTWEIGHT CONCRETE MIXTURE WITH A PHENOL CONTAINING (1) COAL TAR OR (2) ANTHRACENE OIL AND CROSS-LINKABLE PHENOLIC RESIN BLEND.
Claim 3
Dependent Claim
13 words
The improvement of claim 1 wherein the phenol containing material is coal tar.
Claim 4
Dependent Claim
39 words
The improvement of claim 2 wherein the coal tar is a cable tar containing about 40 percent by weight of pitch and about 60 percent by weight of tar oils and has a viscosity of 7* Engler at 50*C.
Claim 5
Dependent Claim
22 words
The improvement of claim 3 wherein the tar is applied at the rate of 90 grams per 38 liters of foamed particles.
Claim 6
Dependent Claim
44 words
The improvement of claim 1 wherein the phenol containing material is an emulsion of from 1 to 3.5 parts by weight of said oil and from 1 to 2 parts by weight of said resin plus 10 weight percent based oN said resin cross-linker.
Claim 7
Dependent Claim
27 words
The improvement of claim 5 wherein said oil is present in the amount of 2.5 parts and said resin is present in the amount of 1.25 parts.
Claim 8
Dependent Claim
23 words
The improvement of claim 6 wherein the emulsion is applied at the rate of about 130 grams per 38 liters of foamed particles.
Claim 9
Dependent Claim
15 words
The improvement of claim 1 wherein the closed cell foamed particles are foamed polystyrene beads.
Claim 10
Dependent Claim
14 words
The improvement of calim 1 wherein said foamed particles are surface coated by spraying.
Claim 11
Dependent Claim
14 words
The improvement of calim 1 wherein said foamed particles are surface coated by spraying.
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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) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |