Additive for concrete or mortar and the use thereof

{
  "publication_number": "US4265674A",
  "country": "US",
  "kind": "A",
  "title": "Additive for concrete or mortar and the use thereof",
  "abstract": "This invention relates to an additive for concrete and mortar comprising a cellulose ether and a non-ionic, low-foaming surface-active agent.",
  "claims": [
    "1. An additive-mixture as a pumping aid for concrete and cement mortar consisting essentially of a water-soluble, non-ionic cellulose ether selected from the group consisting of methylhydroxyethyl cellulose, methylhydroxypropyl cellulose, ethylhydroxyethyl cellulose and hydroxyethyl cellulose, and a non-ionic, low-foaming surface-active agent selected from the group consisting of an optionally modified block polymer of propylene oxide and ethylene oxide, and an alkyl-aryl poly-(ethylene glycol)ether having a small proportion of ethylene oxide molecules, said surface-active agent being present in a proportion of about 0.5 to 20% by weight, based on the weight of said cellulose ether.",
    "2. An additive-mixture according to claim 1 in which said non-ionic, low-foaming surface-active agent is selected from the group consisting of block polymers of 90% of propylene oxide and 10% of ethylene oxide, block polymers of ethylenediamine, as the initiator molecule, and ethylene oxide and propylene oxide, block polymers of a C 12 /C 14 -alcohol and ethylene and propylene oxide, and a nonylphenol polyglycol ether of nonylphenol and 4 moles of ethylene oxide.",
    "3. Concrete or cement mortar including an additive-mixture according to claim 1 as a pumping aid, wherein said cellulose ether is present in a proportion of about 0.005 to 0.5% by weight, based on the weight of the dry solids in the mortar or concrete."
  ],
  "cpc": [
    "C04B 28/02"
  ],
  "assignees": [
    "HOECHST AG"
  ],
  "filing_date": "1979-08-07",
  "publication_date": "1981-05-05",
  "grant_date": "1981-05-05",
  "priority_date": "1978-08-12",
  "application_number": "US-6451579-A",
  "family_id": "6046908",
  "citations": [
    "DE1122895B",
    "DE1671279U",
    "DE2304478A1",
    "DE2319707A1",
    "DE2403444A1",
    "DE2450681B2",
    "DE2704929B1",
    "DE2751764A1",
    "US3885985A",
    "US4058405A"
  ]
}